Bats are nocturnal, meaning they are active at night, and long periods of sleep during the day allow them to store energy for their nighttime activities. Giant armadillos sleep in underground ...

Night time for us means resting from the busy day, but for most bats, this is when they're most active. This is known as being nocturnal. There's roughly 1,400 bat species living around the world ...

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 ...