There are over 1,400 bat species in the world, and they are almost exclusively nocturnal. Bats have traditionally been classified as Microchiroptera, or microbats, and Megachiroptera, or megabats.

Bats are not the only animals that hang upside down. You will also see sloths, parakeets, white-breasted nuthatches, chimpanzees, and many spiders doing it. However, bats are most famous for ...