These are scimitar horned oryx – considered extinct in the wild, they live only in zoos and preserves.
Wikipedia says: “It has been suggested that the myth of the one-horned unicorn may originate from sightings of injured scimitar oryxes; Aristotle and Pliny the Elder held that the oryx was the unicorn’s ‘prototype’. From certain angles, the oryx may be mistaken for having one horn instead of two, and given that its horns are made from hollow bone which cannot be regrown, if an oryx were to lose one of its horns, it would, for the rest of its life, have only one horn.”
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