Why is a bat a mammal and not a bird?

A long time ago, people used to think bats were birds without feathers. But now we know that there is no such thing as a featherless bird. We know that bats are MAMMALS, just like people. Some of the things that tell us bats are mammals: bats are warm blooded; bats nurse their babies with milk; bats have fur. read more

Modern birds have beaks or bills, while bats have toothed mouths. There’s also differences between mammal and bird ear anatomy and bats have mammalian ear anatomy. And finally, while they both have wings it’s not evidence of any connection, it’s just convergent evolution. read more