Whales are descendants of land-dwelling mammals of the artiodactyl order (even-toed ungulates). As in other wild cattle ungulates that form unisexual herds, considerable sexual dimorphism was expressed. Dolphins are descendants of land-dwelling mammals of the artiodactyl order (even-toed ungulates). Flehmen is performed by a wide range of mammals, including ungulates and felids. Leopards are resident at places where wild animals are abundant, and follow herds of ungulates. Both species of wildebeest are even-toed, horned, greyish-brown ungulates resembling cattle. Ghee may be made of milk from various domesticated ungulates, such as cows and sheep. Kybucks are fast, grassland-inhabiting ungulates that inhabit Kashyyyk. Eohippus is an extinct genus of small equid ungulates. Primary food sources are ungulates, particularly deer. Hippos are the only endemic ungulates ever to have lived on Madagascar. In the past, cheetahs used to be tamed and trained for hunting ungulates. Scythian animal style works are typically divided into birds, ungulates, and beasts of prey. Cetartiodactyla includes dolphins, whales and even-toed ungulates. Approximately 25,000 large animals, mostly ungulates, live in the crater.