Questions about bats

From Simple Wikipedia

Bats are mammals in the order Chiroptera. They are the only mammals that can fly. Other mammals like flying squirrels, or flying possum, can glide but not fly. Bats are nocturnal – they are active during the night, dusk, or dawn. Most use echolocation to catch prey and to find their way about. As nighttime animals, bats avoid direct competition with birds, few of which are nocturnal