Flying animal

Animals that have evolved aerial locomotionGreylag geese (Anser anser). Birds are one of only four taxonomic groups to have evolved powered flight.A number of animals are capable of aerial locomotion, either by active flight, passive gliding or, in rare occasions, ballooning, also known as kiting. Such animals typically have appendages that interact with air to generate lift in order to overcome the weight of their own body and any payload they are carrying (e.g. food, prey or nesting materials). The majority of flying and glide animals are terrestrial, although species from one extant taxon, the flying fish, are aquatic. The ability to fly or glide has appeared via convergent evolution many times throughout the history of life. Wing-powered flight has evolved prominently in at least four terrestrial clades: insects, pterosaurs, birds and bats. Gliding and kiting, which are essentially controlled, prolonged free falls, have evolved on many more occasions, primarily among arboreal species, especially in the rainforests of Asia and most especially Borneo. This is likely due to the height of the trees, which makes it costly to descend and travel between trees, and the density of groun