Flehmen

One can observe mucus dripping from the nostrils of stallions after they flehmen.

During the preliminary phase of courtship between captive animals, Matthew Gaughwin observed flehmen on a number of occasions when the male sniffed intensely at areas of ground where the female had previously urinated and once when the male had sniffed the female's cloacal region.

Ladewig and Hart showed that when a male goat displayed flehmen after investigating female urine containing a tracer material, the urine was found throughout the vomeronasal organ.

Behaviors recorded included sniffing, flehmen, blowing, avoidance, and penile erections.