Since bats fly, many people think that they are like birds. About the only similarity between these two creatures is that they fly. Bats are mammals. They have hairy bodies like many other mammals and they feed their young like all other mammals, with milk. There are many species of bats and they vary in many aspects from size to diet.
Bats are quite unique in their physical makeup.
They are the only mammals that fly and that have true wings. Bat wings are modified forelimbs with a flight surface that is covered with a skin membrane and is supported by four fingers. The skin membrane extends down the side of the bat's body and attaches to the hind legs. There is another membrane called the uropatagium. Many bat families h ave some sort of facial ornamentation that can come in a variety of shapes and sizes.