What do all reptiles have in common?
Snakes, lizards, turtles, crocodiles, and a lizard-like animal called the tuatara are all reptiles. They have a backbone and dry, scaly skin. They breathe air with lungs for their whole lives, even sea turtles and sea snakes. Most reptiles lay eggs, and their body temperature changes with the weather around them. Those shared traits put them in the same big family.
Why do crocodile skin plates have bone inside?
A crocodile’s back is covered with thick scales, and under many of them sits a flat piece of bone called an osteoderm. Together the bony plates make a flexible suit of armor that protects the animal. They also help support its heavy body. If you look at a crocodile’s back, the bumpy pattern is the outside of those hidden bone plates.
How are a snake’s ribs different from yours?
You have about twelve pairs of ribs that curl around your chest and meet at a breastbone. A snake has no breastbone, and its ribs run along almost its whole body, from just behind the head to near the tail. The ribs end in loose tips, so the body can stretch wide. Muscles link the ribs to the belly scales, which helps the snake move.
How many backbone bones can a snake have?
Your backbone has about thirty-three bones called vertebrae. Many snakes have far more, from about two hundred to over four hundred. Each joint bends only a little, but all of them together let a snake curl, loop, and wiggle in almost any direction. Longer bodies often mean more vertebrae. A snake’s spine is like a very long string of tiny beads.
Do any snakes have leftover leg bones?
Pythons and boas have tiny claws called spurs near the base of the tail. Under the skin, there are small bones that are leftovers of hips and back legs. Scientists think the ancestors of snakes had legs, and over a very long time the legs got smaller and smaller. These leftover bones are a clue from the past, like a story written inside the body.
How can you tell a legless lizard from a snake?
Some lizards have lost their legs but are still lizards. Many legless lizards have eyelids that blink, small ear openings on the sides of the head, and tails that can break off and regrow. Most snakes have none of these. Legless lizards often move more stiffly than snakes, too. Looking at the head and eyes is the best clue, and a photo is a safe way to study them.
Why do lizards shed their skin in patches?
Lizards grow, and their outer skin layer doesn’t grow with them, so they shed it. Many snakes shed in one long piece, but most lizards peel off flakes and patches. Some geckos even eat their old skin. Under the shedding skin, a new layer is ready, so the lizard is protected the whole time. Shedding helps an animal stay healthy and grow.
Why are some lizard scales bumpy and others smooth?
Different scales do different jobs. Smooth scales help skinks slip through leaves and burrows without snagging. Scales with a small ridge down the middle, called keeled scales, can give grip and make a surface look less shiny. Tiny granular scales, like on a gecko, give skin a soft, bumpy look. The shape of a scale can tell you how an animal lives.
Why do snakes have wide belly scales?
A snake’s belly is covered with wide, overlapping plates called scutes. Each plate’s edge can catch on bumps in the ground like a tiny hook. Muscles tilt the scutes so the edges push against the surface, and the snake moves forward. Belly scutes also protect the snake’s underside. Scientists can even count them to tell some kinds of snakes apart.
How are reptile scales different from fish scales?
A reptile’s scales are part of its skin, made of tough keratin and joined into one sheet, which is why many snakes can shed it as a whole. Most fish scales are thin plates that grow in deeper skin layers and overlap like roof shingles. They look similar, but they are made in different ways. Your fingernails are also made of keratin.
Why don’t reptiles dry out in the sun?
Reptile skin has scales and waxy fats that help seal water inside. Because of this, they lose very little water through their skin, even in hot, dry places like deserts. Reptiles also don’t sweat. These traits help them live in places where other animals would dry out fast. Waterproof skin was a big step for animals living on land.
What makes some snakes glow with rainbow colors?
Some snakes seem to glow with blue, green, and purple when light hits them. That glow comes from tiny ridges and layers in the scales that bend and bounce light, not from paint-like colors. It is the same kind of effect you see in a soap bubble or a CD. The shimmer changes as the snake moves, which can make its body harder to follow.
What are the tiny dots on a crocodile’s jaw?
Close up, a crocodile’s jaw has small dark dots. Each dot is a sense organ that feels the tiniest ripples in water. A crocodile can sense a small splash or movement even in muddy water where it can’t see. Alligators have these dots mostly on their faces, while crocodiles have them all over their bodies. It’s like having extra-sensitive touch.
Why do crocodiles grow new teeth all their lives?
A crocodile’s teeth wear down or break, but it can grow new ones. Each tooth is hollow, and a replacement is waiting inside, ready to move up when the old one falls out. A crocodile might replace each tooth dozens of times in its life. Some estimates suggest an alligator can go through thousands of teeth. You get only two sets, so brush well!
Why is a crocodile’s bite so strong to close but easy to hold shut?
A crocodile’s jaw-closing muscles are huge, so it can clamp down with enormous force. The muscles that open the jaw are much smaller and weaker. That’s a smart design for gripping, but it means the mouth can stay shut with very little effort. People who study crocodiles carefully use this fact to stay safe. Never go near a wild crocodile yourself.
Why do turtles snip their food with a beak instead of teeth?
Turtles have no teeth. Their jaws are covered with a hard, sharp-edged beak made of keratin, the same material as your fingernails. The beak works like scissors to snip plants or bite food into pieces. Beak shapes vary: a snapping turtle has a hooked beak, and a tortoise has a flat one for munching leaves. Birds have beaks, too, but birds evolved theirs separately.
Why do tortoise shells look domed while sea turtle shells look flat?
A tortoise lives on land, where a tall, rounded shell is strong and hard to bite or crush. The dome also gives room for its big insides and can help it roll back upright. A sea turtle needs to glide through water, so its shell is flatter and smoother to cut through waves. Each shell shape matches the animal’s way of life.
How can a box turtle shut its shell like a box?
A box turtle’s lower shell, called the plastron, has a hinge across the middle. When the turtle senses danger, it pulls in its head, legs, and tail, and the two ends of the plastron swing up like lids. The shell closes tightly, leaving few gaps. Not every turtle can do this, which makes the box turtle special. Don’t pick up wild turtles; watch from a distance.
Can you tell a turtle’s age by counting the rings on its shell?
Each plate on a turtle’s shell, called a scute, can grow rings as the turtle grows. It looks like tree rings, but it isn’t a reliable way to count years. Rings can be worn smooth, and a turtle can grow more than one ring in a year when food is plentiful. Scientists get a better age estimate from other clues, such as growth lines in the bones.
Can a turtle feel when you touch its shell?
A turtle’s shell isn’t like a hard hat. It is part of the turtle’s body, made of bone with a layer of keratin on top, and it has nerves beneath. A turtle can feel pressure and gentle touches on its shell. That’s why a turtle may pull in when something bumps it. A shell looks hard, but it is a living part of the animal.
Why do leatherback turtles have no hard shell?
A leatherback sea turtle is the biggest turtle in the world, but its back is covered with thick, smooth, leathery skin instead of a hard shell. Under the skin are thousands of tiny bone pieces and ridges that run down its back. The flexible, light body helps the turtle dive deep into the ocean, where the water pressure is huge.
Why do most lizards’ legs stick out to the sides?
Most lizards have their legs attached on the sides of their bodies, so their elbows bend outward and their bellies stay low. When they run, their bodies swing from side to side. This design works well for scurrying and climbing over rocks. Dogs and cats have legs underneath their bodies, which is better for long runs. Different leg designs fit different ways of life.
Why do crocodiles have belly ribs?
Besides the ribs around their chest, crocodiles have thin, bony rods in the skin of the belly called gastralia. They are not attached to the backbone. These belly ribs help support and protect the soft belly and may help with breathing. Tuataras have them too. Scientists find belly ribs in fossils of many ancient animals.
How do bones tell scientists how old a reptile was?
Bones grow a little each year, and the growth slows in cold or dry seasons. Scientists can slice a tiny piece of bone, such as one from a toe or limb, and see thin lines where growth paused. Counting the lines gives a good guess of the animal’s age. It works much like counting tree rings. This helps researchers learn how long reptiles live.
Why are a snake’s insides long and skinny?
A snake’s body is a long tube, so its organs have to fit inside in a line. Instead of sitting side by side as yours do, the organs are stretched and staggered one behind another. In many snakes, the right lung is long and the left one is very small. The stomach can stretch to hold a big meal. The body is a clever fit.
Why can a lizard go weeks without a meal?
A lizard’s body doesn’t make its own heat, so it burns only a small fraction of the energy that a mammal of the same size does. When the lizard is resting and its food is scarce, it hardly uses any fuel. Many lizards store spare energy as fat. That is why a healthy lizard can wait days or even weeks between meals and still be fine.
What do reptiles do on a cold morning before they can move fast?
A reptile’s muscles work best when its body is warm. After a cool night, it feels slow and sleepy, so it climbs to a sunny rock, branch, or path to warm up. Some face the sun with the body tilted to catch more sunlight. Once warm, the reptile can hunt, run, and think faster. A reptile that is too cold stays tucked away in safety.
Why does each kind of reptile have a favorite temperature?
Every kind of reptile has a range of body temperatures where it works best. Many lizards are happiest in the 90s degrees Fahrenheit, while some forest reptiles like it cooler. Inside that range, muscles, digestion, and thinking all work well. If a reptile gets too cold, it slows down, and if it gets too hot, it can be in danger, so it moves to find just-right spots.
Why do some lizards turn darker when they are cold?
Dark colors absorb more sunlight, so some lizards darken their skin in the cool morning to heat up faster. Later in the day, they can turn lighter to avoid soaking in too much heat. It isn’t magic, just a color change in skin cells that helps them manage warmth. This isn’t the same as camouflage color change in a chameleon.
Why do some reptiles flatten their bodies to catch sunlight?
A flatter body has more skin facing the sun, like opening a big umbrella of heat-catching surface. Some lizards spread their ribs and tilt toward the sun to catch every bit of warmth on a cool morning. Once they are warm, they may pull their bodies up or hide in shade. A reptile’s shape is a tool for solar heating.
Why do crocodiles lie around with their mouths wide open?
Resting crocodiles often keep their mouths open and still. Scientists think the open mouth helps with temperature control, because moist mouth skin lets heat escape as water evaporates, like sweating. It may also let air flow around the animal’s head. Birds sometimes step near the mouth, but it is just a relaxed pose. Crocodiles are wild animals, so watch from far away.
What is brumation?
Brumation is a reptile’s winter slowdown. When the weather gets cold, a reptile moves into a sheltered spot, and its body slows way down. It eats little or nothing, moves very little, and uses almost no energy. It might wake up on warm days for a drink. Brumation is a lot like hibernation in mammals but is not exactly the same.
How can a pond turtle stay under frozen water all winter?
Some turtles, like painted turtles, spend the winter underwater at the bottom of a pond. In the cold, their bodies slow down so much that they need very little oxygen. They can take in oxygen from the water through thin skin, especially around the tail end. Ice may cover the pond above, but the water near the bottom stays just above freezing. Don’t walk on ice.
How does warmth change how a reptile digests food?
A reptile’s stomach and gut work with chemicals that need warmth to do their jobs. In a warm body, food is broken down quickly. In a cold body, digestion slows, and the meal could sit undigested. That’s why a snake that has just eaten often seeks a warm spot. Some reptiles even choose to bask more after a meal.
Why does a python’s gut grow and shrink?
A big python may eat only a few times a year. Scientists have found that its insides change. When a snake swallows a large meal, its intestines, heart, and other organs quickly grow bigger so they can break down the food fast. When the food is gone and the snake rests, those organs shrink back, which saves energy. It is an on-demand body.
How often do reptiles need to eat?
It depends on the animal. A small lizard might snack every day or two, while a large snake might go weeks or even months between meals. Turtles that eat plants nibble often, and a crocodile can fast for a long time. The bigger the meal and the cooler the weather, the longer a reptile can wait before it eats again. Each has its own schedule.
How can a crocodile survive many months without food?
A big crocodile can use its stored fat, especially in its tail, as fuel. Because it is a reptile that doesn’t burn energy to heat its body, it uses very little of that fuel. When prey is scarce, it lies still, saving energy. Some crocodiles can get by for many months, even close to a year, before they need another big meal.
Why is a leopard gecko’s tail so plump?
A leopard gecko’s tail looks thick for a reason. It is full of fat that serves as a snack bag. When food is scarce, the lizard uses the fat for energy. Gila monsters store fat in their tails, too. A fat tail tells you the lizard is well fed, while a thin tail suggests it is hungry. Tail fat is a savings account for hard times.
Why does a lizard’s heart beat faster in the sun?
A reptile’s body temperature goes up and down with the weather, and its heartbeat follows. When a lizard warms up in the sun, its heart beats faster and pumps blood to the muscles, and the animal becomes ready to move. In the cold, the heartbeat slows. Your heart works differently because your body stays near the same temperature all day.
Why are there more kinds of reptiles in warm places?
Warm places give reptiles the heat they need to be active for most of the year. The tropics and deserts have lots of reptile kinds because the weather stays warm for a long time. In cold regions, a reptile has a short season to eat, grow, and lay eggs, so fewer kinds can live there. Heat is a key part of the recipe for reptile life.
Why can’t reptiles live at the South Pole?
Antarctica is too cold and has too few places for reptiles to get warm enough to move, hunt, or lay eggs. No reptiles live on that continent. Even in the far north, only a few hardy kinds, such as certain lizards and snakes, survive in cool places, mostly by spending a long winter underground. A reptile needs warmth from outside, and polar places offer little of it.
How does a leatherback turtle stay warm in cold seas?
Leatherbacks swim in chilly water far from the tropics. They are huge, and a big body loses heat slowly. They also have a thick layer of oily fat and special blood vessels in their flippers that help keep heat inside. Their muscles make warmth as they swim. Together these tricks let them keep their bodies warmer than the water around them.
Why are reptiles called cold-blooded if their blood isn’t always cold?
“Cold-blooded” is an old way to say that a reptile’s body temperature depends on the world around it. A lizard sitting in the sun can have blood that is warm, even warmer than yours. Scientists prefer the word ectotherm, which means “heat from outside.” Birds and mammals are endotherms, making heat inside. Both ways work well for staying alive.
What happens to a lizard in a sudden cold snap?
When it gets very cold, a reptile can become too stiff to move. In Florida, cold-snap nights have caused green iguanas to fall from trees, still alive but stunned. Most wake up when the day warms. Sea turtles can get cold-stunned too, and volunteers carry them to rescue centers. If you see a stunned reptile, tell a grown-up and don’t touch it.
Why do reptiles lie on warm rocks after sunset?
Stone soaks up heat during the day and slowly lets it go in the evening. A snake or lizard can rest on the rock and take in that stored warmth, which keeps it active a little longer. Warm roads work the same way, which is why reptiles sometimes cross them at dusk. Drivers should go slow and watch out for wildlife on warm evenings.
How long can a turtle hold its breath?
Turtles breathe air, but they can stay underwater for a long time. A busy sea turtle may dive for ten minutes or more. When a turtle rests, its body slows, and it can go for hours without a breath. Freshwater turtles slow down even more in winter. A turtle’s slow, steady use of oxygen lets it stay under for much longer than people can.
How do scientists measure a reptile’s temperature without touching it?
Scientists can use a special thermometer that reads heat from a distance. It senses the heat that every object gives off and shows a number. This lets them check the temperature of a lizard’s skin without scaring it or getting close. They can also put tiny sensors in trial models. Reading the temperature helps them learn how reptiles use sun and shade.
Do reptiles sleep?
Yes. Lizards, snakes, and turtles rest in sleeping spots at night or during the heat of the day. Scientists studied bearded dragons and found their brains show two kinds of sleep, which switch back and forth, a bit like some of our sleep stages. Some reptiles sleep with their eyes closed, and others have clear lids. Sleeping spots are often in burrows or hidden places.
How do reptiles drink?
Reptiles drink in different ways. Many lizards and snakes sip from puddles or dew. A chameleon laps raindrops off leaves, and tortoises dip their faces into small pools. Sea turtles get much of their water from their food. Some reptiles can store water in their bodies, which helps them in dry places. After a rain shower, you might see reptiles take a drink.
What does a reptile do from sunrise to sunset?
You wake up warm and ready to go. A reptile wakes up cool and has to warm itself in the sun first. It then spends part of the day hunting, resting, or hiding in shade to keep its temperature right. Because it burns little energy, a reptile may eat only now and then. Its day is built around warmth.
How can a snake pick up sounds without outer ears?
A snake has no ear holes on the outside of its head, but it can still sense sound. Its jawbone rests on the ground and carries vibrations to a tiny bone connected to the inner ear. That means a snake is best at picking up low rumbles and footsteps through the ground. It doesn’t hear high sounds as well as you do. Its “ear” is partly in its jaw.
Why can a basilisk lizard run across water?
A basilisk lizard can sprint over the surface of a pond for several steps. Each foot slaps the water hard and then pushes down to make a small pocket of air around it. Its big feet with fringes and fast steps keep it from sinking right away. It must keep moving fast, and it will swim when it slows down. Young, light basilisks are best at it.
What are the different ways a snake can move without legs?
Snakes move in four main ways. The S-shaped wiggle pushes the body against bumps and rocks. Sidewinding throws the body in loops across loose sand. The accordion move scrunches the body up and stretches it forward in tight tunnels. The caterpillar move uses belly scales to inch forward in a straight line. A snake picks the way that works best on its surface.
How do a sea turtle’s flippers help it swim?
A sea turtle’s front flippers are long and shaped like wings. When it swims, it flaps them up and down in a motion that looks like flying underwater. Its back flippers act like rudders to steer. On land, those same flippers are clumsy, and a turtle moves slowly. In the ocean, the turtle seems to glide with very little effort.
How does a crocodile swim?
A crocodile swims by swishing its strong, flat tail from side to side. Its legs are tucked against its body, and the webbed back feet help with steering. This way it can glide through water almost silently. When it wants to rest, it floats with just its eyes and nostrils above the surface. Stay far from the water’s edge where crocodiles live.
Why do some lizards run on two legs?
When a basilisk or a collared lizard speeds up, it lifts the front of its body and sprints on its back legs. A long tail stretches out behind to keep it balanced, like a seesaw. Running on two legs frees the front legs and lets the lizard take longer steps. It looks funny, but it is a smart way to go fast.
How does a chameleon grip a branch?
A chameleon’s feet are shaped like tongs. Its toes are fused into two groups that clamp around a branch, with sharp claws for extra hold. Its tail can wrap around a twig like another hand. It rocks gently while it walks, like a leaf in the breeze. Together, these tricks keep it steady high in the trees.
How well can a snake see?
Snake eyesight depends on the kind. Many snakes see shapes and movement well, but their view may be blurry up close. Some tree snakes have sharp vision. Every snake has a clear scale over each eye like a tiny window. Snakes can’t zoom their eyes as we do, so they use other senses along with sight. Different snakes use different senses most.
What hidden colors might a lizard see?
Many lizards can see more colors than people can. They have special cells in their eyes that detect ultraviolet light, a kind of light we cannot see. Some lizards even have patches on their bodies that show up in UV, like a secret message to other lizards. To them, the world looks brighter and more detailed. Our eyes see only part of the light that exists.
Can a tortoise remember where home is?
Tortoises can learn the locations of food, water, and shelter. Scientists have shown that some tortoises can learn the path to a snack and remember it later. A tortoise that lives in the same area for years learns its favorite routes. It doesn’t need a map, because it learns by looking at landmarks like rocks, trees, and slopes.
How does a lizard keep its balance on a thin branch?
A lizard has sharp claws or sticky toes that cling to a branch. Its low, flat body keeps its weight close to the surface, and its long tail swings the other way to stay steady. A tiny organ in each inner ear senses tilt, just like yours. When a branch bends, the lizard shifts its feet and tail and keeps on going.
Which reptile is the fastest runner?
Among lizards, the spiny-tailed iguana has been clocked at about twenty-one miles per hour, which is faster than most people can run. Some snakes, such as the black mamba, can slither fast too, but not as fast. Most reptiles prefer short bursts of speed, then rest. Running fast uses lots of energy, so reptiles often sprint only when they need to.
Why are tortoises so slow?
A tortoise carries a heavy shell, and its legs are short and sturdy like pillars. That design is built for strength, not speed. Tortoises eat plants, which don’t run away, and their shell protects them from most danger, so they have no need to hurry. Taking it slow also saves energy, and a tortoise can live a very long life.
Can a crocodile gallop?
Most crocodiles walk or run in short bursts. A few kinds, including the freshwater crocodile of Australia, can actually gallop, bounding with their legs and body like a dog. They do this only for short distances to reach water quickly. Galloping crocs can be surprisingly speedy, which is another reason to keep far away from them in the wild.
How do snakes swim?
Many snakes are great swimmers. A snake pushes against the water with S-shaped waves that travel down its body. A water snake’s lungs can hold air, and that helps it float. Most swimming snakes keep their heads above water. If you see a snake swimming, give it plenty of space and stay on the shore.
Why do sea snakes have flat tails?
Sea snakes live in warm ocean waters. Their tails are flat like paddles, which makes them better at pushing against the water. Their nostrils are on top of the snout, so they can breathe air at the surface. Sea snakes come up for air, but some can stay down for a long time. Their bodies are shaped for a watery life.
Why do some turtles bend their necks sideways?
Turtles pull their heads inside their shells in two different ways. Most North American turtles pull their heads straight back, folding the neck into an S shape. Others, called side-necked turtles, fold the neck sideways and tuck the head under the edge of the shell. Both ways keep the head safe. Which kind a turtle is depends on its family.
Why are many reptile eggs leathery instead of hard?
Many snake and lizard eggs, and some turtle eggs, have shells that feel like soft, bendy leather. The soft shell lets the egg take in moisture from damp soil and swell as the baby grows. It also lets tiny amounts of air pass through. A hard shell would not stretch, but a leathery one can. Soft shells work well when eggs are buried underground.
Why do baby crocodiles chirp before they hatch?
A baby crocodile makes high chirping sounds from inside its egg when it’s ready to hatch. The mother crocodile, nearby, hears the chirps and digs open the nest. She may even gently crack eggs with her mouth to help. Without the chirp, the mom wouldn’t know when to help. It is a message that says, “I’m ready, come get me!”
Which reptiles lay eggs with chalky shells?
Turtles, tortoises, crocodiles, and many geckos lay eggs with hard, chalky shells. A hard shell is rigid and protects the baby inside. It also holds in water, which helps the egg survive in drier places. Tortoise eggs look a bit like ping-pong balls. Whether a shell is leathery or hard depends on the kind of reptile and where it lays its eggs.
Can the warmth of a nest decide whether hatchlings are males or females?
In many turtles and crocodiles, the temperature of the nest helps decide whether a hatchling will be male or female. In many turtles, warmer nests produce more females and cooler nests produce more males. Crocodiles and some other reptiles do it differently. Scientists measure nest temperatures to learn how this works and to keep nest areas healthy.
Where do reptiles hide their eggs?
Many reptiles bury their eggs in soil, sand, or leaf piles, where the temperature is steady and the eggs are hidden. Some use rotting logs, tree holes, or cracks in rocks. Pythons and some skinks stay to guard their eggs. A good hiding spot protects the eggs from drying out and from hungry animals. Choosing the right spot is one of the most important jobs of a reptile mom.
How does an alligator mom build a nest?
A mother alligator piles up leaves, sticks, and mud into a big mound. She lays her eggs in a hole in the middle. As the plants rot, they make gentle heat that keeps the eggs warm. She stays nearby to guard the nest. After the eggs hatch, she helps the babies out. A nest can be a few feet high, so stay away from the wild ones.
How do crocodile moms carry their babies?
A mother crocodile has a mouth full of sharp teeth, but she carries her babies gently. She scoops up hatchlings in her mouth and takes them to the water. She places them in a quiet, shallow nursery. The babies stay close to her for some time. Her careful jaws show how she can be both powerful and gentle. Watch these animals only from far away.
Why do some snake moms wrap around their eggs?
A female python coils around her eggs after laying them. She stays there for weeks and guards the nest. She can even shiver her muscles to make heat and keep the eggs warm. Keeping warm helps the babies grow inside. When the eggs hatch, the mother leaves, and the baby snakes slither off by themselves. It’s a snug and careful start to life.
How does a baby turtle cut its way out of its egg?
A baby turtle has a little hard bump on the tip of its snout called a caruncle, or egg tooth. It uses the bump to slit open the shell from the inside, and then it pushes its head out. After a rest, it climbs out. A few days later, the egg tooth falls off because the baby doesn’t need it anymore. It is a tool just for hatching.
Do baby reptiles go through big changes like frogs do?
Baby reptiles do not change shape the way frogs and butterflies do. They hatch as small copies of their parents, with scales, legs, or shells, ready to find food and hide. They may have slightly different colors or patterns. A baby has all the parts it needs right away. They grow bigger by adding to what they already have.
Why do most baby reptiles take care of themselves?
Most reptile mothers lay their eggs and leave. When the eggs hatch, the babies already know how to find food and hide. They are born with their instincts, which are skills they didn’t have to learn. A few reptiles, such as crocodiles, do stay close and protect their young. Being independent from day one is normal for most baby reptiles.
Why do hatchlings carry a built-in lunchbox?
Before a baby reptile hatches, it has a yolk sac attached to its belly. The yolk is a store of food. After hatching, the baby absorbs the leftover yolk into its body, and this feeds it for days. That gives the hatchling time to find its first meal. A yolk-sac lunchbox is a clever way to start life.
Why do some reptiles have live babies instead of laying eggs?
A few snakes and lizards, including boas and garter snakes, give birth to live young. The mother keeps the eggs inside her body until the babies are ready, and they hatch just as they are born. This can be a good plan in cool places, because the mother can move to sunny spots and warm her babies. Live babies then enter the world ready to go.
Why are baby crocodiles so small next to their parents?
A hatchling crocodile is about as long as a school ruler, but a grown-up might be fifteen feet long. Crocodiles keep growing for many years, so adults are far bigger than babies. In the early years, they grow fast, often a foot or more a year. Being small has some risks, so the babies stay hidden in plants and near their mother.
How long must a reptile nest wait before the babies come out?
It depends on the species and temperature. Many snake and lizard eggs hatch in about six to twelve weeks. Turtle eggs often take around two months. A tuatara’s eggs take more than a year. Warmer nests help eggs hatch faster, and cool ones slow things down. Patience is the name of the game for baby reptiles.
How many eggs does a reptile lay at one time?
The number of eggs in a nest is called a clutch. It ranges from one or two eggs for some small geckos to over a hundred for sea turtles. Large pythons can lay dozens. More eggs give the species better odds that some will hatch and grow up. Reptiles with small clutches often take better care of each one.
How does a turtle dig a nest with its back feet?
A mother turtle crawls to a safe place with soft soil or sand. She uses her back feet like small shovels, scooping out a deep hole. She lays her eggs in it and covers it again. All of this happens without her ever seeing the hole. Then she leaves. The buried eggs stay warm and safe for the weeks ahead.
Why shouldn’t you move reptile eggs?
Inside a reptile egg, the baby is attached to the shell lining in a delicate way. Moving or turning the egg can hurt the baby. If you find a nest or eggs outdoors, stay away and tell a grown-up. Wildlife experts know how to protect them. Leaving eggs where they are keeps the baby safe until it hatches.
Why do hatchling turtles dig out of the nest together?
Baby turtles hatch inside a nest buried in sand. Each one wiggles its flippers, and the group together digs upward, a little at a time. Teamwork helps them move more sand than one baby could. They often come out together, usually at night when the sand is cooler and there are fewer dangers. This is sometimes called a “turtle boil.”
Why do some young skinks have bright blue tails?
Baby five-lined skinks have shiny blue tails. The bright color catches an animal’s eye and draws it away from the head. If a hungry animal grabs the tail, it can break off, and the skink escapes. A new tail grows back. The blue color fades as the skink grows up. It’s a trick that helps the youngster stay safe.
How long do baby reptiles take to become adults?
It depends on the kind. Some small lizards grow up in about a year. Many turtles take ten years or more to be adults, and giant tortoises take even longer. Baby crocodiles grow a foot or more per year at first. Growth depends on food and warmth. A reptile’s speed of growing up matches its size and its lifespan.
Why do volunteers put cages over turtle nests?
Turtle nests are easy to find for animals like raccoons and foxes. People who care about turtles put wire cages over the nests. The cage has holes big enough for baby turtles to go through when they hatch, but small enough to keep out hungry animals. Volunteers mark the place and check on the nest. It is a way to give hatchlings a head start.
How do gecko eggs stay glued in place?
Many house geckos lay hard-shelled eggs that are sticky when new. As the egg dries, the shell glues itself to a wall, a leaf, or the bark of a tree. This keeps the eggs in a safe, hidden place. The tiny babies hatch later with an egg tooth. Sticky eggs are an easy way to hide a nest, even on a vertical surface.
How can baby turtles stay in the nest all winter?
In cold places, some baby turtles, like painted turtles, hatch in the fall but stay in their nest through the winter. They tuck in under the soil, with their bodies slowed down. Some can even handle a bit of freezing in the nest. When spring arrives, they dig out and head for the water. Staying put keeps them out of cold, wet danger.
How big are reptile eggs?
Reptile eggs come in all sizes. The smallest, from tiny geckos, are about the size of a pea. Many snake eggs are the size of a finger. Sea turtle eggs look like ping-pong balls. Large crocodile eggs are bigger than a hen’s egg. A big egg has more yolk food, so the baby is bigger when it hatches. Egg size often matches how big the baby needs to be.
How does a Komodo dragon’s size compare to yours?
The Komodo dragon is the biggest lizard in the world. A big one can grow about ten feet long and weigh around 150 pounds, about as much as a grown-up. It lives on a few islands in Indonesia. Though it is a giant, it is still a lizard with scales, four legs, and a long tail.
Why can some tortoises live longer than people?
Giant tortoises live slow lives. They move slowly, burn energy slowly, and grow slowly, and their sturdy shells protect them. A Seychelles giant tortoise named Jonathan, living on the island of Saint Helena, was hatched around 1832 and is thought to be the oldest known land animal. Slow living may be part of the secret to a very long life.
How long can the longest snake grow?
The reticulated python of Southeast Asia is the longest snake. Some grow more than twenty feet, longer than a minivan. They are slim for their length. The heaviest snake is the green anaconda of South America, which is thicker and can weigh over two hundred pounds. These giants live in tropical forests and wetlands.
How big was Titanoboa, the biggest snake ever?
Titanoboa lived about sixty million years ago in what is now Colombia. Fossil backbones show it was about forty feet long, and it may have weighed about as much as a small car. The fossils were found in a coal mine, along with ancient plants and animals from a hot, steamy forest. It was a giant that has been gone for millions of years.
Which reptile is the tiniest of all?
Some of the smallest reptiles are tiny chameleons from Madagascar and tiny geckos from the Caribbean. One little chameleon is only about an inch long from nose to tail and can perch on a fingertip. These miniature reptiles live in leaf litter and are hard to find. They show that reptiles come in sizes from tiny to huge.
What is a tuatara?
A tuatara looks like a lizard, but it belongs to its own special group. It lives only on some islands of New Zealand. Tuataras are slow and quiet, and they can be active even when it is cool. Many scientists say their relatives lived at the time of the dinosaurs. A tuatara may live for sixty years or more.
Why do tuataras and some lizards have a “third eye”?
On top of a tuatara’s head, there is a small spot that works like a third eye. It is called the parietal eye, and it is covered by skin and scales. It can’t see pictures, but it can sense light and dark. It may help the animal keep track of the time of day or the seasons. Many lizards have a parietal eye, too.
How do marine iguanas live in the sea?
Marine iguanas live only on the Galápagos Islands. They are the only lizards that swim in the sea to eat. The iguanas dive into the cold water to graze on algae growing on rocks. Afterwards, they lie on warm black rocks to bask and heat up again. They swim with their tails swishing from side to side. They’re like tiny dragons in the surf.
Why do marine iguanas sneeze salt?
Eating seaweed in the salty ocean means a marine iguana takes in a lot of salt. Salt glands near its nose get rid of the extra. The iguana snorts, and the salty spray shoots out. Some of the salt dries into a white crust on its head. Your kidneys do the job of clearing salt from your body, but the iguana gets a little help from its nose.
Why do Galápagos tortoises have different shell shapes?
On islands with lots of grass, tortoises have big, round, dome-shaped shells. On drier islands where food grows higher up, like cactus pads, tortoises have shells that rise at the front like a saddle. That gives their necks room to stretch up high. Each island’s plants helped shape the tortoises. It is a good example of a body that matches its home.
Why do reptiles on islands sometimes grow so big?
Islands can be quiet places with few big hunters and lots of food. Some reptiles, like giant tortoises and Komodo dragons, grew very large on islands. With less danger, bigger bodies could survive. Other animals shrank on islands. Scientists study island animals to learn how their surroundings change their size. Islands often have their own special creatures.
Do any reptiles glow?
Some reptiles glow in a special way. When blue or ultraviolet light shines on them, scientists have seen hawksbill sea turtles glow red and green. Some chameleons have bones in their heads that glow blue under UV light. The animals don’t make light on their own; they absorb the light and give back a different color. Only trained scientists do this, so enjoy it from photos.
Why does a frilled lizard open a giant frill?
When an Australian frilled lizard is startled, it opens its mouth wide and flares a big collar of skin around its neck. The frill is held out by thin rods of cartilage, and it makes the lizard look much bigger. Then it may hiss and race away on two legs. The frill may also help the lizard warm up by catching sunlight.
Why do softshell turtles have snorkel noses?
Softshell turtles have flat, leathery shells and long, bendy noses like snorkels. They can bury themselves in sandy bottoms and stick just their noses up to breathe. A long neck lets them reach the surface from a distance. Their flat bodies are good for swimming fast. They have a special shape for a hidden life underwater.
Why does a blue-tongued skink stick out its bright tongue?
A blue-tongued skink is a harmless lizard from Australia. It has a bright blue tongue that looks surprising against its pink mouth. When it feels threatened, it opens its mouth wide, hisses, and sticks out the tongue. The sudden flash of color startles other animals, and the skink gets a chance to leave. It’s a colorful bluff.
Why do sea turtles look like they’re crying?
Sea turtles seem to cry when they come ashore, but they aren’t sad. Big salt glands near their eyes get rid of extra salt from the sea. The salty liquid runs out like tears. This helps keep their bodies in balance, since they take in lots of salt when they swim and eat. Those “tears” are a salt filter.
Why does a shingleback skink have a tail that looks like its head?
The shingleback is a stubby Australian lizard with a short, fat tail that looks like its head. It has thick, bumpy scales that look like pinecone shingles. The look-alike tail might confuse an animal about which end is which. The tail also stores fat for dry times. The skink moves slowly, but its tough scales protect it.
Which reptile weighs the most?
The saltwater crocodile is the heaviest reptile alive. Big males can weigh more than a thousand pounds, and a few have topped a ton. Leatherback sea turtles are heavy, too, and can weigh over a thousand pounds. The biggest animals live in warm places where food is plentiful. Fortunately, crocodiles keep to themselves and stay in their own waters.
What is a worm lizard?
A worm lizard looks like a pink earthworm but is actually a reptile. Worm lizards live underground, and many have no legs. Their skin has ring-shaped folds, and their heads are blunt for pushing through soil. They are not true worms or snakes. They are close relatives of lizards, and they live a hidden life in tunnels.
How does a chuckwalla lock itself into a rock crack?
The chuckwalla is a large desert lizard of the southwestern United States. When it feels disturbed, it squeezes into a narrow crack between rocks and then gulps air to puff up its body. That wedges it tightly in place. This stops other animals from pulling it out. It breathes out later to slip free. It is a clever way to hide.
Which reptiles make loud noises?
Reptiles aren’t usually known for singing, but some are noisy. Geckos can chirp and bark. The tokay gecko is named for its loud call that sounds like “to-kay!” Snakes hiss when they are worried. Crocodiles and alligators roar and bellow. Many make their sounds by pushing air through their throats. Even quiet animals can speak up.
Why does an alligator’s bellow make the water dance?
A male alligator can make a deep, low bellow that shakes the water on its back so that droplets jump up. The rumble is partly too low for people to hear. It travels far through the air and water to tell other alligators where it is. The dancing water is a visible sign of a sound you can feel more than hear.
Which reptile is the closest cousin to birds?
Surprisingly, crocodiles and alligators are the closest living reptile relatives of birds. Millions of years ago, they shared a common ancestor with dinosaurs. Like birds, they lay eggs in nests and often care for their young. They also have a four-chambered heart. Birds and crocodiles look different, but their family tree connects them.
How many kinds of reptiles are there?
Scientists have named more than twelve thousand kinds of reptiles. Most are lizards, with around seven thousand kinds, and snakes, with about four thousand. There are a few hundred turtles and tortoises, a couple dozen crocodiles and alligators, and the tuatara. Reptiles live on every continent except Antarctica, from hot deserts and rainforests to oceans and mountain slopes. New kinds are still being counted, so the total keeps growing a little each year.
Are there still new reptiles to discover?
Yes. Every year scientists find and name new kinds of reptiles, often more than a hundred. Many are found in remote forests, mountains, and islands. Some have been hiding in plain sight, like lizards that look alike but are different kinds. New tools such as DNA tests help to tell them apart. There is always more to learn.
Are snakes really slimy?
No. A snake’s skin is dry and smooth. It is covered with scales, which are tough, thin plates that can look shiny and wet but feel cool and dry. Snakes don’t make slime. People think they are slimy because they look slippery, but a snake’s scales are not sticky or wet. It is a good thing to know, but remember to watch wild snakes from a safe distance.
Do snakes chase people?
Snakes don’t chase people. Most snakes are shy and want to be left alone. If a snake sees a person, it will usually freeze, hide, or slither away. A snake that seems to come toward you is often just trying to find a way out or a place to hide. Giving a snake space keeps both of you safe.
Are most snakes dangerous to people?
Most snakes are harmless to people. Only a small share of snake kinds have venom strong enough to hurt a person, and even those would rather escape than bite. Many snakes help us by eating mice and insects. Still, no one should touch wild snakes, because you can’t always tell which is which. Respect and distance are always the best choices.
Is venom the same thing as poison?
Venom is a liquid some animals make in special glands and inject with a bite or sting. Poison is a substance that harms you if you touch or swallow it. A venomous snake uses its venom mostly to protect itself or subdue small prey. Not every dangerous animal is venomous, and not every venomous animal is dangerous to people. Knowing the difference helps scientists, doctors, and you stay safe.
Can you tell if a snake is venomous by the shape of its head?
Some people say snakes with triangle-shaped heads are venomous, but this rule is not reliable. Some harmless snakes flatten their heads to look scary, and some venomous snakes have narrow heads. Because there are so many kinds, even experts need a close look. The only rule you need is to leave all wild snakes alone and back away.
Can a snake hypnotize you?
No. A snake cannot hypnotize anybody. Snakes do have a still, unblinking stare because they have no eyelids. Their eyes are covered by clear scales that don’t close. That staring look can seem spooky, but it doesn’t have any power. A snake mostly watches for movement and wants to avoid trouble. There is no magic in its gaze.
Do snakes really steal milk from cows?
This is a very old myth. Snakes cannot suck milk the way a calf can, and a snake’s body can’t digest milk well. A snake’s mouth can’t make suction like a calf’s. Stories like this started because people saw snakes near barns, where they were looking for mice. When you hear a surprising animal story, you can check it with a book or a scientist.
Why is hand-washing a must after meeting a reptile?
Healthy-looking turtles, lizards, and snakes can carry germs such as Salmonella on their skin. The germs don’t bother the reptile, but they can make people sick. After you touch a reptile or anything from its home, wash your hands well with soap and water for at least twenty seconds. Don’t touch your face or food first. Soap helps wash the germs away.
Why do turtles cross roads?
In late spring and summer, mother turtles travel to find soft, sunny ground to lay eggs. Turtles also walk between ponds and wetlands to find food and new homes. Roads cut through these paths, so turtles sometimes try to cross. Because turtles are slow, they are in danger from cars. Drivers can help by going slowly and watching for animals.
How can people help a turtle cross the road?
If you see a turtle in the road, tell a grown-up. If it is safe, the adult can carry it across in the same direction it was heading. If the turtle goes back the other way, it will just try to cross again. Large snapping turtles can bite, so leave them to experts. Always put safety first, and never stop in traffic.
How can you hike safely in snake country?
Stay on the trail, wear closed shoes, and watch where you put your feet and hands. Don’t reach into holes, under logs, or into rock cracks. Step onto rocks and logs, not over them, so you can see the other side. If you see a snake, stop and back away slowly. Hiking with a grown-up is always a smart choice.
Why is it best not to feed wild alligators, turtles, and lizards?
Feeding wild animals may seem kind, but it can hurt them. Alligators and crocodiles that are fed can lose their fear of people, which makes them unsafe. Turtles and lizards fed human snacks can get sick, since their bodies need natural foods. In many places it is also against the law. The best way to help wild reptiles is to leave them alone.
Why shouldn’t you take a wild turtle home?
A wild turtle knows its home territory, where it finds food, water, and places to hide. If it is taken away, it may not survive. Many turtles live for decades, so it would be a very long commitment. In many places, collecting wild turtles is not allowed, since some kinds are rare. Look and learn, take a photo, and leave the turtle where you found it.
What should you do if you find an injured reptile?
Don’t touch it, and don’t try to move it. Tell a grown-up right away. They can call a wildlife rescue group, an animal shelter, or a local park office. Trained people know how to help safely. Keep pets away and stay at a distance until help comes. Washing your hands is a good idea if you accidentally touched anything.
Do alligators really live in city sewers?
This is an urban legend. People tell stories about alligators in sewers, but sewers are not good homes. They are dark, cold, and have little food. Alligators need warmth, sunlight, and fresh water. Now and then, a lost or unwanted pet alligator has turned up in a city, but not living in the sewers. Wild alligators live in swamps, rivers, and lakes in warm places.
Are turtles and tortoises the same thing?
Turtles and tortoises are close cousins. Tortoises live on land and have high, domed shells and sturdy, round feet. Many turtles spend lots of time in water and have flatter shells and webbed feet or flippers. People sometimes use the words in different ways in different places. Scientists say all tortoises are a kind of turtle.
Are snakes and lizards related?
Yes. Snakes and lizards belong to the same big group of reptiles. Scientists believe snakes came from lizards that lost their legs over millions of years. Some lizards, such as legless lizards, look a lot like snakes. But snakes have some special features, like no eyelids and a flexible jaw. Both are scaly, and both shed their skin.