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
Dwarf dog-faced bat is insectivorous and forages in groups. They generally eat small beetles, termites, winged ants, and moths. Some have been appeared to consume pollen, as well, which is common in insectivorous bats, but this is not confirmed, as the pollen could have been picked up while foraging for insects in flowers. This species is nocturnal, and uses echolocation to hunt for prey. They have been observed to roost near food sources to minimize foraging costs. This species of bat utilizes a polygynous mating system, with males mating with many females in a single breeding season. The breeding season varies region to