The bighorn sheep rams of Glacier National Park engage in head-butting sessions primarily during the mating season, known as the rut, but they square off year round and bunch of visitors in a parking lot had front row seats earlier this month to an epic clash of heads.
Bighorn head-butting behavior serves several important purposes related to reproduction including establishing dominance hierarchy, physically blocking other males from mating with receptive females, and signaling to females that the males are ready and capable of mating:
