When bats aren't flying, they often dangle from cave ceilings or the undersides of bridges. But why do bats sleep upside down?
This topsy-turvy behavior may result from the evolutionary journey bats took toward flight, said Tara Hohoff, a bat biologist and the coordinator of the Illinois Bat Conservation Program. "As bats evolved from land-bound mammals to taking flight, they started with gliding like flying squirrels," Hohoff told Live Science.
