Bats like these straw-colored fruit bats (Eidolon helvum) live together in large groups. When species intermingle in a roost, they may share viruses with one another. Credit: David Hayman/Colorado State Univ.
As intimidating as they might sound, vampire bats aren’t usually in the business of bothering humans for their blood. In fact, the hairy-legged vampire bat species was thought to feed almost exclusively on birds.