Unicorn Cow

The classical Jewish understanding of bible did not identify the Re'em animal as the unicorn. Instead, the Tahash animal (Exodus 25, 26, 35, 36 and 39; Numbers 4; and Ezekiel 16:10) was thought to be a kosher unicorn with a coat of many colors that only existed in biblical times.
Medieval unicorns
Medieval knowledge of the fabulous beast stemmed from biblical and ancient sources, and the creature was variously represented as a kind of wild ass, goat, or horse.