Polycerate

Polyceraty has been observed in ancient sheep remains dating to c. 6000 BCE from Çatalhöyük in modern Turkey.

[1] Polycerate sheep breeds include the Hebridean, Icelandic,[2] Jacob,[3] Manx Loaghtan, Boreray and the Navajo-Churro.

One example of a polycerate Shetland sheep was a ram kept by US President Thomas Jefferson for several years in the early 19th century in front of the White House.

In the spring of 1808 this ram attacked several people who had taken shortcuts across the square, injuring some and actually killing a small boy.

[8] There have been incidents of polycerate goats (having as many as eight horns),[9] although this is a genetic rarity thought to be inherited.