We know now that bats, like humans, are mammals. They are warm-blooded and they nurse their babies. Bats come in many different colors besides black, brown, or gray, others are yellow, orange, red, or white. There are some bats that are so brightly colored they are known as butterfly bats. Bats have fur and the ones that roost outside have longer hair than those that roost in caves.
Bats clean their fur using their tongue and claws just like a cat.
Bats may have swooped around the huge heads of dinosaurs 60 million years ago. Some scientists think bats have been around longer than 60 million years. Fossils have helped scientist come to this conclusion. The Thailand bumblebee bat is the smallest bat and the smallest of all mammals. It weighs less than a penny.