What is a three letter horned animal called?

There isn't a single three-letter horned animal name. Here are some possibilities:

* "Ram" is a male sheep, which has horns. It has four letters, though!

* "Yak" is a large, long-haired ox with horns. It also has four letters.

* "Gnu" is an African antelope with horns. It has four letters.

There are no common English words for a horned animal that have only three letters.