Bats are the only true flying mammals. They give birth from mid-May through July, and they nurse their pups in the same way other mammals do. Bats either migrate or hibernate during the winter. In the winter, bats go into a deep, extended torpor called hibernation. It is very important not to disturb hibernating bats because they can lose valuable energy reserves and die.
All bats can see.
It is a very sophisticated sonar system inaudible to the human ear. The bat emits signals that go in waves. When the sound-waves strike an object, they return to the bat's ear as echoes. Bats suck our blood. There are only three species of bats that feed on blood.