This mature Desert Bighorn Ram is scent checking a ewe in order to check her readiness for breeding. This is called the "Flehmen Reaction" or "Flehmen Response".

SheepDesert SheepDesert Bighorn SheepOvis canadensis nelsoniRamHemenway ParkBoulder CityNevadaBighorn SheepMammalHornsClark CountyJulyFlehmingFlehmen ResponseFlehmen PositionFlehmen ReactionCarnero de las RocosasMuflón de las MontañasMuflón CanadienseBorrego Cimarron