flehmen

[ fley-muh n ]
/ ˈfleɪ mən /

noun Animal Behavior.

a behavioral response of many male mammals, especially deer, antelope, and other artiodactyls, consisting of lip curling and head raising after sniffing a female's urine.

Origin of flehmen

< German Flehmen, noun use of infinitive: (of a domestic ungulate) to curl the lip; compare dial. (Upper Saxony) flemmen to look spiteful; further relations unclear