A close-up photo of a whitetail deer buck lip curling (Flehmen response), which is a behavior often exhibited by rutting bucks encountering a doe that may be in estrous. This facilitates the transfer of pheromones and other scents into the vomeronasal organ.
Tags: animals, behavior, bucks, close-ups, Flehmen response, lip curling, rutting, whitetail deer, wildlife
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