Flehmen is the term used to describe the behavior in which a horse extends its neck, raises its head, and inhales as it rolls its upper lip back, displaying its front teeth. Sharon Crowell-Davis, DVM, PhD, Dipl. ACVB explains that horses display the flehmen response to facilitate transfer of inhaled scent molecules (pheromones and possibly some other substances) into the vomeronasal organ (VNO)

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