Egyptian fruit bat their days roosting in trees or caves, often with large groups of other bats, sometimes numbering in the thousands. They emerge from the roost to forage for food in the late evening, and return just before dawn. They hang upside down, with their wings folded closely around their bodies. Egyptian fruit bats, along with other species in the genus "Rousettus", are the only megachiropterid bats to use echolocation, which they accomplish by emitting a series of sharp clicks with their tongues. The clicks are normally slow and constant, but these clicks speed up dramatically when the bats approach an object.
Virginia big-eared bat make sounds that then echo off of objects around them, enabling them to find their prey while flying in the dark. Typically they prey on insects like moths, beetles, termites, mosquitoes and flies. Without echolocation, the bats would not be able to locate food. When analyzed, 97% of Virginia big-eared bat fecal pellets showed that the bat had consumed and digested Lepidoptera. Lepidoptera is a classification of insects that contains butterflies and moths. In Kentucky a similar study was done, examining the fecal pellets and stomach contents of the bats in and around the caves. The processed food showed that