Book 31, Question 37
Why do swifts have such tiny feet?
A swift spends nearly all of its life in the air.
It eats, drinks, and even gathers nest material while flying. Its feet are tiny and weak because it hardly ever needs to land on a flat surface. It can cling to rough walls or inside chimneys, but it cannot perch on a branch like a robin. Its long, narrow wings do most of the work.