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any of various very large extinct Tertiary horselike perissodactyl mammals that had clawed feet but otherwise resembled titanotheres

Any of various large extinct mammals of the family Chalicotheriidae of the Eocene to the Pleistocene Epochs. Chalicotheres were odd-toed ungulates related to horses, rhinos, and tapirs, and had three toes on each foot ending in distinctive curved claws rather than hooves. Some species had front claws so long that they walked on their knuckles.