From Phys.org:
Some members of the Bovidae family have additional horns. In fact, a few local breeds of sheep, which have been selected by many generations of breeders, are known for their multiple horns. Some goats may spontaneously develop an extra pair of horns as well, particularly in the Alps. Evidence of the existence of these animals, known as polycerate, goes back several centuries, for example, the transfer of a four-horned goat, from the town of Bulle in Switzerland to the Queen's farm in Versailles in 1786—requested by Queen Marie-Antoinette—is duly recorded. However, the genetic causes of this morphological anomaly remained unknown, until now. (Read more.)
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