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Rhinos and tapirs are more closely related to each other than to horses. The separation of horses from other perissodactyls took place according to molecular genetic analysis in the Paleocene some 56 million years ago, while the rhinos and tapirs split off in the lower-middle Eocene , about 47 million years ago.
Perissodactyls range in size from the 1.8 m (6 ft) long Baird's tapir to the 4 m (13 ft) long white rhinoceros. Over 50 million domesticated donkeys and 58 million horses are used in farming worldwide, while four species of perissodactyl have potentially fewer than 200 members remaining.
Brontotheriidae is a family of extinct mammals belonging to the order Perissodactyla, the order that includes horses, rhinoceroses, and tapirs.Superficially, they looked rather like rhinos with some developing bony nose horns, and were some of the earliest mammals to have evolved large body sizes of several tonnes.
Tapiroidea is a superfamily of perissodactyls which includes the modern tapirs and their extinct relatives. Taxonomically, they are placed in suborder Ceratomorpha along with the rhino superfamily, Rhinocerotoidea.The first members of Tapiroidea appeared during the Early Eocene, 55 million years ago, and were present in North America and Asia during the Eocene.
] Outside strict biological classification, the related term pachyderm is commonly used to describe elephants, rhinoceroses, hippopotamuses and tapirs. Cuvier himself defined Pachydermata as "animals with hoofs, non ruminants", whereas Storr had described it as "mammals with hoofs with more than two toes".
Equidae (commonly known as the horse family) is the taxonomic family of horses and related animals, including the extant horses, asses, and zebras, and many other species known only from fossils. The family evolved more than 50 million years ago, in the Eocene epoch, from a small, multi-toed ungulate into larger, single-toed animals.
Hannah, a 13-year-old white rhinoceros, has delivered a newborn calf in a rare zoo birth for the almost endangered species. The arrival of the male calf, named Silverio, two weeks ago marked the ...
The 1.5-m-long beast was related to palaeotheres, and suspected to be the ancestor of modern tapirs and rhinoceroses.Physically, it would have looked very similar to modern tapirs, although it probably lacked the tapir's characteristic proboscis.