Chalicotheres were a group of herbivorous, odd-toed ungulate
(perissodactyl) mammals spread throughout North America, Europe,
Asia, and Africa during the Early Eocene to Early Pleistocene
subepochs living from 55.8 mya-781,000 years ago, existing for
approximately 55.02 million years.[not in citation given]
They evolved around 40 million years ago from small, forest
animals similar to the early horses. Many chalicotheres, including
such animals as Moropus and Chalicotherium, reached the size of a
horse. By the late Oligocene, they had divided into two groups: one
that grazed in open areas and another that was more adapted to
woodlands. They died out around 3.5 million years ago, and are
related to the extinct brontotheres, as well as modern day horses,
rhinoceroses, and tapirs.
United Nations Farms