Many mammals run and walk. Some hop, swim, and even glide from trees. But only one group of mammals can truly fly: bats! Bats live in a variety of habitats around the world, from deserts to mountaintops. The short-nosed fruit bat lives in tropical forests. These bats are only active at night. They fly fast and low, sometimes covering 62 miles (100 km) in one night in search of fruit. During the day, they roost in caves and palm trees.