What makes an animal a mammal?
Mammals are animals that make milk to feed their babies. They also have hair or fur at some time in their lives, even whales have a few whiskers. Their bodies make their own heat, so they stay warm in cold weather. A mammal has three tiny bones in each ear and a muscle called the diaphragm under its lungs. You are a mammal too.
Why do all mammals have three tiny bones in each ear?
Inside your ear are three bones called the hammer, anvil, and stirrup. They are the smallest bones in your body. When sound hits your eardrum, the bones pass the shaking along to the inner ear. Millions of years ago, the ancestors of mammals used some of these same bones in their jaws. Over time, they became tiny helpers for hearing.
What are the three big groups of mammals?
Mammals fall into three groups. The first group lays eggs: the platypus and the echidnas. The second group, the marsupials, give birth to tiny babies that finish growing in a pouch or on the mother’s belly, like kangaroos and koalas. The third group, the placental mammals, grow inside the mother until they are more developed. Most mammals, including dogs, cats, and people, belong to this last group.
About how many kinds of mammals are known to science?
Scientists know of about 6,500 kinds of mammals. That sounds like a lot, but there are many more kinds of birds, fish, and insects. Mammals live on land, in the sea, in the air, and underground. They range from tiny shrews to enormous elephants. New mammals are still found now and then, especially small ones that hide in forests.
Which family of mammals has the most members?
Rodents win by a lot. About four out of every ten mammal kinds are rodents, such as mice, rats, squirrels, beavers, and guinea pigs. They can live nearly anywhere because they are small, eat many foods, and can have many babies. Rodents have front teeth that never stop growing. You probably live near a few kinds.
What is a diaphragm, and why do mammals have one?
The diaphragm is a dome-shaped muscle under your lungs. When you breathe in, it pulls down and gives your lungs room to fill with air. When you breathe out, it relaxes and moves up. Every mammal has one, and it helps them breathe deeply and steadily. Sometimes the diaphragm twitches, and that’s what makes a hiccup.
How does a mammal keep its body temperature steady?
Mammals make their own heat by turning food into energy. Most keep their bodies at a steady temperature, somewhere around 97 to 102 degrees Fahrenheit. When they are cold, they shiver or fluff their fur. When they are hot, they pant, sweat, or find shade. A steady temperature lets mammals stay active in cold places and at night.
Why do mammals have such big brains for their size?
Mammals have a brain layer called the neocortex, which helps them learn, remember, and solve problems. It’s one reason mammals can learn new tricks, find their way around, and play. Young mammals spend time with parents, so they have time to learn. Brain size varies, but many mammals are clever animals. Your brain weighs about three pounds.
Why do almost all mammals have seven neck bones?
A giraffe has a very long neck, and you have a short one, but both have seven neck bones. A giraffe’s bones are just much longer. This number has stayed the same in nearly all mammals for millions of years. Only a few, such as sloths and manatees, have a different count. It’s a clue that all mammals share a family history.
Why do platypuses and echidnas lay eggs if they are mammals?
The platypus and the echidna are mammals that lay soft, leathery eggs. After the babies hatch, the mother feeds them milk, so they are mammals, too. They have fur, but no teeth as adults. These few animals show us what early mammals may have been like. They live in Australia and New Guinea.
What is special about marsupials?
Marsupials are mammals whose babies are born very small and finish growing outside the mother’s body. Many mothers, but not all, have a pouch to hold and protect the baby while it nurses. Kangaroos, koalas, wombats, and opossums are marsupials. Their short time inside the mother and long time nursing is a different way to raise young.
How does a placenta feed a baby before it is born?
In placental mammals, a special organ called the placenta grows in the mother’s body. It connects to the baby by a cord. The mother’s blood brings food and oxygen to the placenta and passes them to the baby. The baby’s waste goes the other way. The placenta helps the baby grow longer before birth, so it is more ready for the world.
Are all marsupials from Australia?
Most marsupials live in Australia and nearby New Guinea. But other marsupials, called opossums, live in North and South America. The Virginia opossum is the only marsupial in the United States and Canada. Long ago, marsupials lived in many places. Today, they live where there are few kinds of placental mammals competing for their homes.
What is the tiniest mammal?
The Etruscan shrew and the bumblebee bat both weigh about as much as two paper clips. A shrew’s heart beats extremely fast, and it must eat nearly all day to stay alive. These tiny mammals look like miniature versions of bigger ones. Being small helps them hide in tiny places, but it also makes keeping warm a big job.
Which mammal is the heavyweight of the land?
The African elephant is the largest land mammal, weighing about six tons, which is as much as three or four cars. Its heavy body is held up by thick legs. Its ears are huge and help it cool off. A baby elephant weighs as much as a grown-up person when it’s born. Elephants eat leaves, grass, and bark all day long to get enough food.
Why are people mammals too?
People are mammals. We have hair, we make milk for babies, we are warm-blooded, and we have three ear bones and a diaphragm. We even have a tailbone. When scientists compare our bodies to those of other animals, they see many matches. We are most closely related to apes and monkeys. People are mammals who walk upright and use tools.
How do scientists sort mammals into groups?
Scientists put mammals into groups called orders. The meat-eaters, such as dogs and bears, are carnivores. The rodents have gnawing teeth. Primates, like monkeys and people, have grasping hands. Hoofed animals include horses and deer. Animals that are in the same order share body features and a family history. Sorting helps scientists understand how mammals are related.
Why do your arm and a horse’s leg have similar bones?
Look at the bones of a human arm, a dog’s leg, and a horse’s leg. They all have a long upper bone, two lower bones, a wrist, and finger-like bones. A horse’s leg bones are long, and it walks on one big toe, like the tip of your middle finger. This match shows that mammals came from a common ancestor, and bodies change to fit each way of life.
What do eye positions say about how a mammal lives?
Animals like rabbits and deer have eyes on the sides of their heads, which gives them a wide view all around. They can see almost behind them without turning their heads. Animals like cats and monkeys have eyes at the front, which helps them judge distances well. Eye position is a clue about how an animal lives and how it finds food and notices danger.
Which mammal has scales?
A pangolin looks like a scaly lizard, but it is a mammal. Its hard scales are made of keratin, the same material as your fingernails. Pangolins live in Africa and Asia and eat ants and termites. When frightened, a pangolin curls into a tight ball. It also nurses its baby with milk, which proves it’s a mammal.
Why do mammals have lips and cheeks?
Lips and cheeks might seem ordinary, but they are special mammal features. A newborn mammal needs to suck milk. Strong lips close around the mother’s nipple, and cheek muscles help make suction, like drinking through a straw. Reptiles and birds don’t drink milk this way. Lips and cheeks also help mammals chew, hold food, and make some sounds. Your lips started as a feeding tool.
What were the first mammals like?
The first mammals lived more than 200 million years ago. They were small, like shrews or mice, and many were active at night. They hid in burrows or under logs. They lived at the same time as the dinosaurs. Their bones show fur, three ear bones, and a way to nurse babies. They were the beginning of a big family.
Why did mammals get bigger and more varied after the dinosaurs?
For millions of years, most mammals were small. About 66 million years ago, the big dinosaurs disappeared, and many places opened up for new animals. Mammals took advantage. Over time, some grew large, some learned to swim, and some took to the air. Today there are tiny shrews and huge elephants. Open spaces gave mammals room to change.
Which mammals live in the most places on Earth?
Humans live on every continent, even in research stations in Antarctica. Rodents such as house mice and brown rats have also traveled with people almost everywhere. Some wild mammals, like foxes and bats, live on many continents too. Mammals can do this because they stay warm, eat many foods, and learn quickly. A mammal that adapts easily can settle nearly anywhere.
Do all mammals have tails?
Most mammals have tails. Cats use their tails for balance, and horses use theirs to swat flies. A beaver’s tail is flat like a paddle. But apes, including humans, have no outside tail. We have a tiny set of bones at the bottom of our spine called the tailbone. Koalas have only a tiny stub. Tails come in all shapes.
What is mammal milk made of?
Milk is a drink that mothers make to feed their babies. It is mostly water, but it also has fat for energy, protein for growing, sugar called lactose for fuel, and minerals like calcium for bones. A mother’s body builds milk from the food and water she takes in. Babies of every mammal drink milk at the start of life, and it gives them everything they need.
Why is milk different from one mammal to another?
Every kind of mammal has its own milk recipe. A rabbit mother feeds her babies only once or twice a day, so her milk is very rich in fat and protein. Some mothers nurse their babies all day long, and their milk has less fat. People’s milk has a different mix than cow’s milk. Each recipe fits how fast the baby grows and how often it feeds.
What is colostrum, the first milk?
The first milk a mother makes is called colostrum. It is thick and often yellowish. It is packed with antibodies, which are tiny protectors from the mother’s body that help the baby fight germs. A baby’s body is new and not ready for many germs yet. Colostrum acts like a first shield. After a few days, the milk changes into regular milk.
Why can a baby giraffe stand soon after birth while a baby mouse cannot?
Some mammals, like giraffes, horses, and deer, are born with open eyes and strong legs. A giraffe calf can stand in about an hour, because it must keep up with its herd. A baby mouse is born tiny, pink, and hairless and stays in a nest. Both plans work. They are different ways to start life.
Why are some baby mammals born blind and hairless?
Baby mice, rabbits, kittens, and puppies are born with their eyes closed and with little or no fur. They cannot see or walk and depend on their mothers for warmth and milk. Being born early in their growth lets the mother have many babies at a time, and they grow quickly in the safety of a nest or den. After a few weeks, their eyes open and they are on their way.
How do newborn mammals know how to nurse?
A newborn mammal doesn’t need lessons for its first meal. It has instincts, which are skills it is born with. A baby turns its head toward its mother’s warmth, uses its sense of smell, and opens its mouth when something touches its cheek. This is called rooting. Then it finds the nipple and starts to suck. Instincts help a baby get food right away.
What is weaning?
Weaning is the time when a baby mammal slowly changes from drinking milk to eating other food. Mothers may start to nurse less often, and babies begin to nibble leaves, seeds, or bits of food. Some mammals wean in weeks, and others take years. Weaning gives the young time to get used to new foods and grow strong enough to find their own.
Why do baby mammals play?
Play looks like fun, and it is. It is also practice. Young lions pounce at tails, puppies tumble in play fights, and young goats leap and run. These games build strong muscles, quick reflexes, and social skills. When the babies grow up, they will need all of those skills. Play is how baby mammals train their bodies and brains.
How does a newborn marsupial find its way to the pouch?
A newborn kangaroo is blind, hairless, and about as big as a jellybean. It must climb up the mother’s belly fur all by itself to reach her pouch. It uses its strong front arms to pull itself through fur and goes by smell and feel. The trip takes only a few minutes. Once inside, the tiny joey attaches to a teat and begins to nurse.
Why do some marsupial pouches open backward?
A kangaroo’s pouch opens at the top, but a wombat’s pouch opens toward its back legs. Wombats dig burrows with their front paws, and a pouch that faces backward keeps dirt out. A Tasmanian devil’s pouch also opens toward the back. The shape of the pouch matches how the mother lives and digs. Different animals have different pouch designs.
How can a mother kangaroo make two kinds of milk at once?
A mother kangaroo may have a tiny newborn in her pouch and an older joey that now hops outside but comes back to drink. Her body makes different milk for each. The newborn’s milk is lighter, and the older joey’s milk is richer with fat to fuel its growing body. Each baby uses its own teat. It’s a clever way to feed babies of different ages.
Why do baby koalas eat a special food from their mother?
Koalas eat eucalyptus leaves, which are tough and can be harmful to many animals. A baby koala eats a soft food called pap from its mother. Pap helps move helpful bacteria into the joey’s belly so it can digest leaves later. It happens at about six months old, when the joey begins to eat solid food. Tiny helpers in the gut make a huge difference.
How do baby elephants learn to use their trunks?
A baby elephant is born with a trunk that doesn’t work well yet. It wobbles, and the calf may step on it or flop it around. Over the first months, the baby practices picking up grass, splashing water, and sucking up a drink. With the help of its family, the trunk becomes strong and skillful. Learning to use it can take a long time.
Why do puppies and kittens sleep so much?
Young animals sleep a lot because their bodies and brains are busy growing. While they sleep, their bodies build bones and muscles, and their brains store what they learned that day. A puppy or kitten may sleep sixteen to twenty hours a day. That is why they play hard, then fall asleep suddenly. Sleep is part of growing up.
Why do baby animals look so cute?
Baby mammals often have big eyes, round heads, and soft features. These features make people and other animals want to care for them. Scientists call it the baby look. This is helpful because a helpless baby needs lots of care. The cute look helps parents want to feed and protect it. It is nature’s way of getting babies loved.
Why should you leave a seemingly lost fawn or bunny alone?
A baby deer or rabbit alone in a field may look lost, but its mother is probably nearby. Many mammal mothers leave their young hidden while they feed. Don’t touch or move the baby, and keep pets away. Touching it can scare the mother away. If it looks hurt or is in danger, tell a grown-up to call a wildlife rescue center. Usually the best help is to leave it be.
How does a mother sheep find her own lamb?
A mother sheep can pick out her lamb in a big flock using smell and sound. A lamb learns its mother’s voice, too. Many mammal mothers sniff their babies soon after birth and remember the scent. Baby calls and smells are like name tags. That way, mothers feed only their own babies and find them again in a crowd.
Why do some mammals have litters while others have just one baby?
A mouse can have five to ten babies at once, called a litter, while an elephant or a giraffe usually has just one. Small animals face many dangers, so having many babies gives some a better chance. Big animals care for one baby for a long time and invest a lot in it. Each plan fits the animal’s size and way of life.
How long do mammal babies grow before they are born?
The time a baby grows inside its mother before birth is called gestation. A mouse’s is only about three weeks. A dog’s is about two months, and a person’s is about nine months. An elephant’s is almost two years, the longest of any land animal. Bigger mammals usually need more time to develop. Each baby gets the time it needs.
Where do newborn mammals get their warmth?
Newborn mammals are not good at making heat. Mothers keep babies warm by snuggling them close, sharing body heat, and building nests of fur, grass, or leaves. Many baby animals huddle together in a pile. Some mothers hold babies against their bare skin. Warmth helps the babies grow instead of using energy to shiver. Cozy babies are healthy babies.
Why do baby mammals squeak and cry?
Baby mammals use calls to tell their mothers what they need. A hungry puppy whines, a kitten mews, and a baby seal bleats. Mothers listen carefully, because the call tells them where the baby is and how it feels. Some baby mice squeak at pitches too high for people to hear. A baby’s voice brings help.
What is a mother’s tongue doing when she washes her newborn?
A newborn needs a gentle cleaning, and a mother’s tongue is the perfect tool. Licking dries the baby and warms it. It also helps the baby start breathing and get its body working. Licking helps mother and baby learn each other’s smell so they can find each other later. It’s both a bath and a hug.
Which mammal dads help care for their babies?
In many mammals, the mother does most of the work, but some dads help. Male marmosets carry their babies around on their backs. Red fox fathers bring food to the den. Some monkey dads are the main caretakers. Helping raise babies gives the young more care and a better chance to grow up. Dads come in many kinds.
Why do horses walk on their tiptoes?
A horse walks on one toe on each foot, and its hoof is like a giant toenail. Its leg bones are long and its muscles are near the top, so each step is long and light. What looks like a horse’s knee is really its wrist. Standing on tiptoe lets a horse run fast and cover lots of ground. It’s a body built for speed.
Why do cats walk on their toes with their claws tucked in?
A cat’s claws can slide into a sheath of skin and pop out when needed. Keeping the claws tucked in protects them from wear, so they stay sharp. It also makes cats quiet walkers, because their claws don’t click on the floor. Cats walk on their toes with soft pads under them, which gives them stealth and bounce. When a cat wants to climb, out come the claws.
What are hooves, claws, and nails made of?
Hooves, claws, and nails are all made of keratin, a tough protein. Your fingernails and hair are made of keratin, too. In a horse, keratin forms a thick, hard hoof. In a cat, it shapes a sharp, curved claw. In a monkey, it forms a flat nail. The material is the same, but the shape changes to match the job. Keratin grows from the base and wears off at the tip.
Why do some horses wear horseshoes?
A horse’s hoof is like a big toenail, and it wears down on hard ground like roads and rocky trails. A horseshoe is a metal U shape that is attached to the bottom of the hoof to protect it. A trained person called a farrier trims the hoof and fits the shoe. It doesn’t hurt, because the outer part of the hoof has no feeling, like your fingernails. Wild horses usually don’t need shoes.
Why do cows and deer have two-toed hooves?
Cows, deer, and goats each walk on two toes on each foot, and each toe has its own hoof, so the foot looks split. Split hooves can spread apart to grip mud, snow, and rocky ground. The two toes also help the animal keep its balance on uneven ground. It is a sturdy design for a plant-eater who spends all day on its feet.
What is the difference between odd-toed and even-toed hoofed mammals?
Hoofed mammals come in two types. Horses, rhinos, and tapirs have an odd number of toes, with the middle toe carrying most of the weight. Cows, deer, pigs, giraffes, and hippos have an even number of toes, usually two or four. Scientists use toe counts to sort these animals into groups. A toe count is a clue to a family tree.
How do camels walk on soft sand without sinking?
A camel has wide, flat feet with thick, leathery pads. When it steps, the foot spreads out and holds up the heavy body like a snowshoe on sand. Its two toes are joined by tissue that helps spread its weight. The pads are tough, so the sand does not burn the camel’s feet. A camel’s feet are built for desert walking.
Why do dogs’ claws always show?
A dog can’t tuck its claws away like a cat can. The claws stay out and touch the ground as it walks, so they work like the cleats on running shoes. They help a dog grip dirt and grass when it runs and turns. Walking on hard pavement wears the claws down. They’re built for traction, not for sneaking.
Why do cats scratch things?
Cats scratch for several reasons. Scratching helps remove the old outer layers of their claws, so sharp new claws can show. It also stretches their shoulders and back. And it leaves a scent mark from tiny glands in the paws, which says, “This is my place.” That is why a scratching post is such a useful tool. Scratching is a natural, healthy habit.
Why do bears have such long claws?
A bear’s claws are long and strong. They are not for walking, because bears walk on flat feet. Bears use their claws for digging in dirt, tearing open rotten logs to find insects, and gripping tree trunks to climb. A bear uses them like garden tools. In the wild, bears are best watched from far away, so always keep a safe distance.
What are paw pads for?
The soft pads under a dog’s or cat’s paws are made of tough skin with a cushion of fat and stretchy tissue inside. They absorb shock when the animal runs and jumps, give grip on slippery ground, and help sense vibrations and textures. Dogs also lose some body heat through their paws. Pads are like built-in running shoes.
How does a squirrel climb headfirst down a tree?
Most animals can’t go down a tree headfirst, but squirrels can. A squirrel has special ankles that can rotate about 180 degrees. When it climbs down, it turns its back feet backward so its claws point up and hook into the bark. That keeps it from falling. It is like having reverse gear on your feet.
How does a mole dig through the ground?
A mole has wide, strong front paws with big claws, like shovels. They face outward, so the mole can sweep the dirt aside as it moves forward. It has tiny eyes and soft fur that lies flat in any direction, so it can move backward in a tunnel too. A mole’s body is a digging machine, built for life underground.
Why do kangaroos hop?
A kangaroo’s big back legs have springy tendons, like rubber bands. When the kangaroo lands, the tendons stretch and store energy, and then they snap back to help it bounce into the next hop. That means the kangaroo uses less energy hopping fast than running. A kangaroo can go over 30 miles per hour in a burst. Hopping is a smart way to travel.
How do horses move at different speeds?
Horses move in four main ways, called gaits. A walk is slow and has four beats. A trot is faster, with diagonal legs moving together. A canter has three beats, and a gallop is the fastest, with four beats and a moment when all four feet are off the ground. Switching gaits helps a horse save energy. Each gait has its own rhythm.
Why do giraffes and camels move both legs on the same side together?
Most four-legged animals move their legs in diagonal pairs when they walk. Camels and giraffes do something different: they pace, moving the two legs on the same side at the same time. Their legs are long, and pacing may keep their legs from bumping each other. It makes them sway side to side as they stride. Different bodies, different steps.
How fast is the fastest land mammal?
The cheetah is the fastest, with bursts of about 60 to 70 miles per hour. A cheetah’s long legs, flexible spine, and big lungs help it. It can only keep that speed for a short time, and then it needs to rest. The pronghorn antelope can run fast for longer, at about 35 miles per hour. Fast animals have different kinds of speed.
How can a heavy elephant walk so quietly?
An elephant weighs several tons, but it can walk almost silently. Under each foot is a thick cushion of fat and stretchy tissue. When the foot touches the ground, the cushion squishes out and spreads the weight. When the foot lifts, the cushion shrinks. This soft padding keeps its steps quiet and its feet from sinking too deep.
Which mammals have webbed feet?
Mammals that swim a lot often have webbed feet. Otters and beavers have skin between their toes that works like a paddle. The platypus has webbed front feet that fold back when it walks on land. Muskrats and some other water-loving rodents have partially webbed feet. Webbed feet push more water backward with every kick.
How can sloths hang upside down for hours?
A sloth has long, curved claws like hooks, and strong arms. Special tendons in its fingers lock so it can hold on without using much energy. It doesn’t have to squeeze its muscles all the time. Because of this, a sloth can rest while hanging for a long time. It moves slowly and saves energy. A sloth is a champion of hanging.
What is a dewclaw?
Some dogs have an extra small toe on the inside of their front legs, higher up than the other toes. It is called a dewclaw. It doesn’t touch the ground when the dog walks. Some dogs use it like a thumb to hold bones or to grip when climbing. Some dogs have them on the back legs too. Even animals in the same family can be a little different.
Why do bears and people walk on flat feet while dogs walk on their toes?
Mammals walk in three ways. Bears, raccoons, and people walk on the whole foot, which is steady. Dogs and cats walk on their toes, which gives longer strides. Horses and deer walk on the tips of their toes, which lets them run fast. Each way suits a lifestyle. The longer the stride, the faster the animal can go.
How can horses sleep standing up?
Horses have a special system of tendons and ligaments in their legs that lets them lock their joints in place. This means a horse can doze while standing without falling over. It rests in the field and can run away quickly if needed. For deep sleep, a horse will lie down for short periods. Locked legs give a horse a safe way to nap.
How do cats land on their feet?
When a cat falls, it twists its body in the air so its feet point down. A cat has a very bendy backbone and a good sense of balance. It turns its front half and then its back half. It also spreads its legs out like a parachute. This is called the righting reflex. It happens in less than a second. Never drop a cat to test it.
Whose claws are the longest of any living mammal?
The giant armadillo has the longest claws of any living mammal. The claw on each front foot can be about eight inches long, about as long as a banana. It uses these claws to dig into hard ground and open termite mounds. The armadillo lives in South America. It is shy and active at night, so few people ever see one.
How can you tell a monkey from an ape?
Monkeys and apes are both primates, but they have some clear differences. Most monkeys have tails, and apes do not. Apes, like gorillas, orangutans, chimpanzees, and gibbons, are usually larger, have wider chests, and can swing their arms in big circles. Monkeys often walk on all fours along branches. Humans are apes too.
Why do primates have fingernails instead of claws?
Most primates have flat nails on their fingers and toes instead of sharp claws. The flat nails support the soft pads at the tips of their fingers, which are great for gripping branches and feeling things. They let primates hold small objects and peel fruit. Sharp claws would get in the way of delicate hand work.
Why do primates have eyes that face forward?
Monkeys and apes have eyes on the front of their faces. Each eye sees a slightly different view, and the brain combines them to judge how far away things are. This depth perception is useful for leaping from branch to branch and for picking fruit. Forward eyes make a smaller field of view but a very sharp one.
Why do monkeys see more colors than dogs do?
Many primates, including people, have three kinds of color-sensing cells in their eyes. That lets them see reds, greens, and blues. Scientists think this helps them spot ripe fruit among green leaves, or tender young leaves, which are often reddish. Seeing more colors helped primates find better food. Many other mammals see fewer colors than primates do.
What is an opposable thumb?
An opposable thumb is one that can swing across your hand and touch your other fingertips. This lets you pinch, twist, and hold things tightly. Many primates have opposable thumbs. Try picking up a pencil without using your thumb, and you will see how helpful it is. Thumbs give primates fine control to peel fruit, hold tools, and groom.
Why do orangutans have such long arms?
An orangutan lives in rainforest trees in Southeast Asia. Its arms can stretch to about seven feet when held out, much wider than its body is tall. Long arms and strong hands help it reach branches far away and hang on while it moves slowly through the treetops. Their long arms make them superb climbers.
Why do gorillas and chimpanzees walk on their knuckles?
When gorillas and chimpanzees walk on the ground, they curl their fingers and rest on their knuckles. Their arms are long, and their fingers are strong and good at gripping branches. Walking on knuckles protects the fingers’ soft parts and keeps the fingers ready for climbing. It’s a clever way to walk on all fours while keeping hands ready to climb.
Why are chimpanzees and bonobos our closest cousins?
Scientists compare the DNA of animals to see how related they are. Chimpanzees and bonobos share about 98 percent of their DNA with people. Our families split from a common ancestor six to seven million years ago. Chimpanzees and bonobos are not our grandparents. They are cousins who went in a different direction. They are the closest living relatives to people.
Why do baby primates cling to their mothers?
A baby monkey or ape holds on to its mother’s fur while she travels. Their hands and feet are built to grip. Even human babies have a strong grasp reflex at birth. Clinging keeps the baby safe and warm, and it lets the mother move around to find food. Holding tight is a baby primate’s first skill.
Why do primates have such long childhoods?
Primates have big, complex brains, and there is a lot to learn. Young monkeys and apes spend years with their mothers, learning what to eat, how to climb, and how to get along with others. A longer childhood means more time to learn. A chimpanzee stays with its mother for years, and people take even longer.
Do monkeys use tools?
Some monkeys do. In Brazil, bearded capuchin monkeys pick up heavy stones and use them as hammers to crack open hard nuts on flat rocks. This takes strength and practice, and young monkeys learn by watching adults. Using tools shows a monkey can plan and solve problems. People use tools too, but we are not the only ones.
What do chimpanzee faces tell us?
Chimpanzees have expressive faces. They pull their lips back into a wide grin when they feel scared or nervous, and they push their lips out when they are excited or want to get something. They use faces, sounds, and gestures to talk. Their faces make it easy to guess how they feel. Faces are important for communication in many primates.
Why does a mandrill have such a colorful face?
A mandrill is a large monkey from the forests of Africa. It has a bright red nose and blue ridges along its snout. The brightest colors belong to confident adult males, and the colors show others in the group who is who. A mandrill’s face is like a signal flag, helping group members read each other.
Why do lemurs live only on one island?
Lemurs are primates that live naturally only on Madagascar, a large island off the coast of Africa. Scientists think their ancestors arrived millions of years ago, probably floating on mats of plants across the sea. With no monkeys to compete with, they evolved into many different kinds. Madagascar has over a hundred kinds of lemurs.
Why do ring-tailed lemurs sunbathe?
In the cool morning, ring-tailed lemurs sit upright and face the Sun with their arms spread. Their bellies are thinly furred, so the sunlight warms them quickly. After a chilly night, this saves energy. Lemurs sit in groups and warm up together. It looks a little like they are doing yoga. Watch lemurs only from a distance.
Why do gibbons sing duets?
Gibbons are small apes of Southeast Asia. In the morning, pairs of gibbons sing loud, whooping songs together. The songs carry over a mile through the forest. The calls tell neighbors, “This is our home.” They also help the pair stay close and work as a team. A gibbon duet is like a forest radio show.
Why does the aye-aye tap on trees?
The aye-aye is a lemur from Madagascar with big ears and a very long, thin middle finger. It taps on tree branches with that finger and listens for hollow spots with its big ears. When it finds one, it gnaws a hole and uses the finger like a hook to pull out insect grubs. It is a night-time hunter with a built-in tapping tool.
Why do gorillas beat their chests?
A big male gorilla called a silverback stands up and thumps his chest, making a loud hollow sound. It lets other gorillas know where he is and how big and strong he is, usually without a fight. It also warns others to keep their distance. Gorillas are mostly gentle plant-eaters who prefer peace. The drumming is a way to talk.
Can apes learn to use symbols to talk to people?
Some apes have learned to use pictures or signs to tell people what they want. A bonobo named Kanzi learned to touch symbols on a keyboard and could understand many spoken words. Scientists still debate how much this is like human language. Apes are clever and can communicate in many ways. They also talk to each other with gestures and calls.
Do chimpanzees comfort each other?
Researchers have watched chimpanzees comfort friends who are upset. A chimp may put an arm around another chimp, or give it a gentle pat or a hug. This kind of caring is also seen in other apes. It shows that apes have feelings and notice each other’s feelings. Comfort helps a group stay close and calm.
How do scientists learn about wild primates without bothering them?
To study wild monkeys and apes, scientists spend months or years quietly watching the animals from a distance. They take notes, use binoculars, and set up cameras. After a while, the animals get used to the observer and act naturally. They learn the animals’ names and families. This patient watching has taught us a lot about how primates live.
Why do snow monkeys soak in hot springs?
Japanese macaques, often called snow monkeys, live in mountains with snowy winters. In some places, they soak in natural hot springs to stay warm. The warm water keeps them cozy while snow falls around them. Young monkeys learn from older ones. Natural hot springs can be too hot for people, so watch these monkeys from a distance.
Why do many monkeys live in big groups called troops?
Many monkeys and apes live in groups. A troop has more eyes to watch for danger, more noses to find food, and more helpers to share babysitting. Members call to each other, groom each other, and keep an eye on the little ones. Living together can be noisy and busy, but a troop looks after its members.
Are people apes?
Yes. Scientists group humans with the great apes: chimpanzees, bonobos, gorillas, and orangutans. People have no tails, have broad chests, and have shoulders that can rotate widely, just like apes. We share a common ancestor with them. We are the only apes who walk upright all the time and build cities. Humans are special apes.
What makes people special among primates?
People walk upright on two legs, speak languages, make complex tools, and have big brains with a long childhood. We pass on knowledge by writing and teaching. But we also share a lot with other primates, such as caring for babies, using tools, and feeling emotions. Studying them helps us understand ourselves. We are part of the primate family.