Both ewes and rams have horns, but the ram’s horns are much larger and sometimes are fully curled. These horns are used to clash or battle against competing bighorn sheep to achieve dominance.
These two rams were sizing each other up, making it appear as if one was going to slash the other's throat. In addition the ram in front is displaying the classic “lip curl” used to sense whether or not a ewe is in estrous and receptive to breeding.
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