Animal echolocation in the external ear. There are two hypotheses about the evolution of echolocation in bats. The first suggests that laryngeal echolocation evolved twice in Chiroptera, once in the Yangochiroptera and once in the horseshoe bats (Rhinolophidae). The second proposes that laryngeal echolocation had a single origin in Chiroptera, was subsequently lost in the family Pteropodidae (all megabats), and later evolved as a system of tongue-clicking in the genus "Rousettus". Individual bat species echolocate within specific frequency ranges that suit their environment and prey types. This has sometimes been used by researchers to identify bats flying in an area simply by
Ghost-faced bat of food. They are often found feeding over standing water. Because these bats tend to roost in larger colonies they are susceptible to parasites and rabies which have been known to wipe out entire colonies. The ghost-faced bat survives on a diet of small insects. They use echolocation to identify their food at night and are able to catch insects in the darkness with little or no additional light. Very little is known about their reproduction and development. These bats only seem to carry one embryo at a time and are thought to give birth in the spring between March