Lion (Panthera leo) showing a flehmen response, also called the flehmen position, flehmen reaction, flehming, or flehmening is a particular type of curling of the upper lip that facilitates the transfer of pheromones and other scents into the vomeronasal organ, also called the Jacobson's organ. Usually happens after scenting a female's urine. MalaMala (Mala Mala) Game Reserve. Mpumlanga. South Africa.