The flehmen grimace is a rather comical sight produced by many male mammals. The main organ involved in the grimace is the Jacobson’s (vomeronasal) organ, in the nasal cavity just above the roof of the mouth.
The function of flehmen is to identify reproductive status of a possible sexual partners by ‘analyzing’ pheromones in the air.
To accomplish this the male will inhale a lot of air through the mouth which will then reach the Jacobson’s organ.
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