Megabats constitute the suborder Megachiroptera, and its only family Pteropodidae of the order Chiroptera (bats). They are also called fruit bats, Old World fruit bats, or, especially the genera Acerodon and Pteropus, flying foxes. Fruit bats are restricted to the Old World in a tropical and subtropical distribution, ranging no further than the eastern Mediterranean and South Asia, and are absent from northwest Africa and southwest Australia. Compared to insectivorous bats, fruit bats are relatively large and, with some exceptions, do not navigate by echolocation. They are herbivores and rely on their keen senses of sight and smell to locate food.