Megabat evolved early in the lineage of chiropterans. Although echolocation was later lost in family Pteropodidae, bats in the genus "Rousettus" are capable of primitive echolocation through clicking their tongues, and some species have been shown to create clicks similar to those of echolocating bats using their wings. Both echolocation and flight are energetically expensive processes. The nature of the flight and echolocation mechanism of bats allows for creation of echolocation pulses with minimal energy use. Energetic coupling of these two processes is thought to have allowed for both energetically expensive processes to evolve in bats. The loss of echolocation may
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