This was because they were thought of as a flying mouse. Others thought of the mouse as a bird. The bat is more closely related to primates. Bats can fly like a bird. But, they do not have feathers, build nests, or lay eggs.
Bats are mammals.
Their bodies are covered with fur. They are born live and not hatched from an egg. There are almost 1,000 species of bats. They are different in size, color, body features, habitat and diet. They live in nearly every part of the world.