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Bull Moose sniffing for pheromones.  Pheromones are  a secreted or excreted chemical factor that triggers a social response in members of the same species. Pheromones are chemicals capable of acting outside the body of the secreting individual to impact the behavior of the receiving individual. There are alarm pheromones, food trail pheromones, sex pheromones, and many others that affect behavior or physiology. This guy is keyed in on the sex pheromones, that is why he is smiling