Are Bats Birds?

Bats can fly. So, some children suppose they are birds. But, in fact, they are flying mammals. Birds multiply by laying eggs, while bats bear live baby bats that grow up on their moth er’s milk. Birds have feather but bats do not; they only have a thin layer of supple hair, just like other types of mammals do. Birds have wings, while bats have four limbs as other mammals do. Bats' forelimbs have changed, and between the forelimbs and lower legs is a thin layer of wing membranes. It is this layer of wing membranes that enables bats to fly.