Muskoxen (Ovibos moschatus) and bighorn sheep (Ovis canadensis) are known for their dramatic head-to-head battles. But all that noggin-knocking has a cost, researchers from the Icahn School of ...

Bighorn males, called rams ... rugged mountain terrain. Wild sheep live in social groups, but rams and ewes typically meet only to mate. Rams live in bachelor groups and females live in herds ...