flehmen

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flehmen

the ritual of urine sniffing; a behavioral component of libido in the male animal. The animal appears to be carrying out a test for odor in the urine. He sniffs the urine or the perineum, then extends the head, dilates the nostrils, and lifts and curls the upper lip. See also gape.
References in periodicals archive ?
Interestingly, during the urine study not one buck displayed a flehmen response.
Pheromone-laced urine elicits a so-called flehmen response from a bull.