Knowra Perissodactyla Perissodactyla Perissodactyla is an order of hoofed mammals whose weight-bearing axis usually passes through the third toe. Living members are horses, rhinoceroses, and tapirs.
Ungulate : A hoofed mammal, including living groups such as horses, rhinoceroses, cattle, and deer. Perissodactyls are one major lineage traditionally grouped among hoofed mammals.
Equidae : The horse family, comprising horses, asses, and zebras, along with their extinct relatives. Equidae is the perissodactyl family with the most specialized single-toed limbs.
Phenacodontidae : An extinct family of early placental mammals, often considered close to the ancestry of several ungulate groups. Phenacodontids help frame debates about the earliest evolutionary context of perissodactyls.
Artiodactyla : An order of even-toed hoofed mammals that includes pigs, camels, deer, cattle, and hippopotamuses. Its usual weight-bearing axis through the third and fourth toes contrasts with perissodactyl limb structure.
Domestication of the horse : The process by which humans bred and managed horses, beginning on the Eurasian steppe several thousand years ago. Horse domestication transformed transport, warfare, agriculture, and communication.
Odd-toed ungulate : A hoofed mammal whose main weight-bearing axis passes through one or three toes. This body-plan description gives Perissodactyla its common name.
Rhinocerotidae : The rhinoceros family, a group of large herbivorous mammals with one or two horns. Rhinocerotidae represents one of the three living perissodactyl families.
Hyracotherium : An extinct early equid genus of small mammals that lived during the Eocene. Fossils assigned to Hyracotherium have figured prominently in accounts of horse evolution.
Cetartiodactyla : A mammal clade combining even-toed ungulates with cetaceans, the group that includes whales and dolphins. Its evolutionary breadth contrasts with the separate perissodactyl lineage.
Horse : A domesticated equid, Equus caballus, used worldwide for transport, work, sport, and companionship. The horse is the most extensively domesticated living perissodactyl.
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