Bats and birds both can fly, yet they developed this ability independently. Bats are mammals, just like humans, which means that all bats are warm-blooded, have hair, bear live young, and feed their babies milk.
All bats can see, but some use a special sonar system called echolocation.
These bats make high frequency calls either out of their mouths or noses and then listen for echos to bounce from the objects in front of them. They are able to form pictures in their brains by listening to reflected sounds just like we form pictures in our brains by interpreting reflected light with our eyes. In this way, bats are able to comfortably move around at night, avoiding predators, maneuvering around obstacles, locating their food, and capturing insects in total darkness. Unlike the bodies of other animals, a bat's body is best adapted for hanging upside down. Its hind limbs have rotated 180 degrees so that its knees face backwards.