A small herd of Zebra in the Kruger Park. One of the males is displaying a flemen response or what is known as a ‘flemen grimace’. This is because the animal is drawing back its top lip in a manner which makes it look like it is grimacing. The lip-curling allows air to be drawn over the vomeronasal organ. This chemo-sensory organ is located in the roof of the mouth and allows the animal to pick up chemicals messages. Buck, Zebra buffalo and predators display the ‘flemen grimace’.In the case of this Zebra, he must be smelling a scent of a female.