Flehmen

Mule Deer Buck Exhibiting Flehmen Behavior During Autumn Rut. Rocky Mountain Arsenal NWR, Colorado

Flehman: (fley-muhn)

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.
Definition courtesy of dictionary.com

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