13777617 - Bighorn Sheep ram (Ovis canadensis) performs lip curl (flehmen display) in the North Fork of the Shoshone River valley near Yellowstone National Park; Wyoming, United States of America13777602 - Large Bighorn Sheep ram (Ovis canadensis) with massive horns performs lip curl (flehmen) display during the rut near Yellowstone National Park; Montana, United States of America71419137 - Africa, Tanzania, Serengeti. Lion displaying the Flehmen reaction, which is a reaction to female hormones but looks like a laugh.70382260 - Black Rhinoceros Diceros bicornis - Also called Hook-lipped Rhinoceros Bull does the ´flehmen´, the typical grimace of many male mammals when they capture the scent of a female Masai Mara National Reserve, Kenya71182121 - A male lion ,Panthera leo, doing the flehmen grimace, Tsavo, Kenya, East Africa, Africa
