Bats are winged mammals, the only mammals capable of true and sustained flight. Bats are more agile in flight than most birds, flying with their long spread-out digits covered with a thin membrane or
The early Eocene fossil microchiropteran Icaronycteris, from the Green River Formation
Giant golden-crowned flying fox, Acerodon jubatus
"Chiroptera" from Ernst Haeckel's Kunstformen der Natur, 1904