Science Fair Project Encyclopedia The Flehmen response is a
particular type of curling of the lips in ungulates, felids, and
many other mammals, which facilitates the transfer of chemicals
into the vomeronasal organ. This behavior allows animals to
smell the urine of others in order to determine several factors.
These factors can be the presence or absence of estrus, the
physiological state of the animal, and how long ago the animal
passed by. This particular response is most recognizable in
stallions when smelling the urine of a mare in heat. The
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