Which mammals fly?

There is only one mammal that flies: the bat. Most bats are nocturnal, which means they sleep during the day and are most active at dawn, dusk, or nighttime. During the day, they sleep by hanging upside down in groups called roots. Most bats, called microbats, eat flying insects, such as moths and flies, but others eat small mammals, like mice. Some insect-eating bats can land on the ground and chase insects that live in leaf litter or dirt. One of these bats, the pallid bat, feeds on scorpions and large centipedes. Others eat fish or live on cow’s blood. The largest bats are megabats, which feed mostly on fruit.

A fruit bat, like all bats, is a large flying mammal, not a bird.