A deer stands close to the camera, its ears perked up, amidst the lush greenery of a forest in Nara, Honshu, Japan, Asia

European rabbit (Oryctolagus cuniculus) with ears perked up, portrait, Lower Austria, Austria, Europe

Livestock - A young colt standing at attention on a green pasture in late afternoon light / Douglas County, Wisconsin, USA.

Close-up portrait of a Bengal tiger (Panthera tigris tigris) standing in the forest looking up, Madhya Pradesh, India

A wild dog, Lycaon pictus, lies on the ground, looking away, bloody face, ears perked, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A wild dog, Lycaon pictus, lies on the sand of the river bank, looking out of frame over shoulder, ears perked, Sabi Sands, Greater Kruger National Park, South Africa

The side profile of the head of a male nyala, Tragelaphus angasii, ears up and perked, looking away, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

Hyena cubs, Crocuta crocuta, walk out of their den site, ears perked up in the sunlight, Sabi Sands, Greater Kruger National Park, South Africa

A leopard, Panthera pardus, walks across a clearing, tail curled in the air, in the foreground a male impala with horns faces the leopard with ears perked, Aepyceros melampus, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa