Megabats constitute the 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. Megabats are found in tropical and subtropical areas of Eurasia, Africa, and Oceania. 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. Megabats are so called for their larger weight and size, weighing up to one kilogram (two pounds) with wingspans reaching over one meter (several feet) in length. The tails are short if present, but are often effectively absent. The digestive system is structured to a herbivorous diet, sometimes restricted to soft fruit or nectar.