Serval (Felis serval) cub on termite mound showing the back of its ears, Masai Mara National Reserve, Kenya, East Africa, Africa

Serval (Felis serval) cub on termite mound showing the back of its ears, Masai Mara National Reserve, Kenya, East Africa, Africa

Red Deer (Cervus elaphus) group of hinds standing in rain, lead female has ears back. Isle of Mull, Argyll, Scotland, UK

Arctic hare (Lepus arcticus) in the snow, Churchill, Manitoba, Canada

A backlit male hippopotamus (Hippopotamus amphibius) stands half-submerged in water, staring menacingly towards the camera. His skin is pink and grey, and one ear is folded back. Grumeti Serengeti Tented Camp, Serengeti National Park; Tanzania

A leopard, Panthera pardus, lies on a dead tree branch, tail drapes down, yawning with ears back and eyes closed, in black and white, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A warthog piglet, Phacochoerus africanus, stands in short grass, ears back, Sabi Sands, Greater Kruger National Park, South Africa

A leopard, Panthera pardus, turns over its right shoulder, looking out, ears back, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A leopard, Panthera pardus, walks along a dirt track, ears back, dry brown grass background, Londolozi Wildlife Reserve, Sabi Sands, Greater Kruger National Park, South Africa

The back of a head of a lioness, Panthera leo, ears back, front paw resting on tree trunk, claws showing, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A leopard, Panthera pardus, crouching low, stalks through dry grass, ears back, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A leopard, Panthera pardus, crouches down to drink water, direct gaze, ears back, ripples in water, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A mother leopard, Panthera pardus, carries her cub in her mouth towards the camera, ears back, along game path, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A male leopard, Panthera pardus, walks on a dirt track, ears back, Londolozi Wildlife Reserve, Sabi Sands, South Africa

A leopard, Panthera pardus, lying down resting its head on a branch, ears back, Sabi Sands, Greater Kruger National Park, South Africa

A female leopard, Panthera pardus, lies on a boulder in sunlight, ears back, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A leopard, Panthera pardus, walks towards the camera on a sand road, looking away, ears back, mouth open, in black and white, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A leopard, Panthera pardus, lies on a broken tree branch, drapes its feet and tail over the branch, looking away, ears back, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A pride of lion, Panthera leo, and their cubs walk through a river causeway, ears back, wound on one leg, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A leopard, Panthera pardus, claws the trunk of a tree, ears back, looking out of frame, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A bushbuck, Tragelaphus sylvaticus, walks across a still stream, ears back, looking out of frame, greenery in background, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

An African wild dog, Lycaon pictus, backlit, walks away from camera through grass, ears back, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A giraffe's head, Giraffa camelopardalis, chewing, ears back, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A pack of wild dog, Lycaon pictus, running, ears back, feet off the ground, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A lioness, Panthera leo, yawns, eyes closed, ears back, Sabi Sands, Greater Kruger National Park, South Africa

A pride of lions, Panthera leo, walk in a river bed towards camera, looking out of frame, ears back

A cheetah's head, Acinonyx jubatus, looking away, ears back, mouth open, in black and white, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A lioness, Panthera leo, with no tail walks across a river, ears back, looking away, splashing, sunset in the background, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A white rhino, Ceratotherium simum, covered in mud, ears back, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa