Perissodactyla (, from Ancient Greek περισσός, perissós 'odd', and δάκτυλος, dáktylos 'finger, toe') is an order of ungulates. The order includes about 17 living species divided into three families: Equidae (horses, asses, and zebras), Rhinocerotidae (rhinoceroses), and Tapiridae (tapirs). They typically have reduced the weight-bearing toes to...