Edwin Giesbers / Portrait of Sumatran tiger (Panthera tigris sumatrae) walking towards camera with face half cast in shadow, and ears held back in agressive posture, captive

Edwin Giesbers / Portrait of Siberian tiger (Panthera tigris altaica) crouching in snow, ears back and ready to attack, captive

Anup Shah / Ring-tailed Lemur (Lemur catta) male wrist-marking the tail, lip lared and ears back, during territorial confrontation. Berenty Private Reserve, Madagascar. Oct 2008.

Anup Shah / African lion {Panthera leo} rear view of young cub looking over the back of lioness, Masai Mara GR, Kenya

Anup Shah / Lioness rear view of head (Panthera leo) Masai Mara, Kenya

Ernie Janes / Ripe Barley ears in field, Norfolk, England, UK, May.

Ernie Janes / Ripe Barley (Hordeum vulgare) ears black and white backlit image.

Ernie Janes / Ripe Barley (Hordeum vulgare) ears black and white backlit image.

Juergen Freund / Colony of Little red flying foxes (Pteropus scapulatus) roosting, with their ears and wings backlit, Atherton Tablelands, Queensland, Australia.

Cyril Ruoso / Feral Horse (Equus caballus) head portrait with ears back, Namib-Naukluft NP, Namibia.

Ernie Janes / Ripe Barley (Hordeum vulgare) ears in field ready for harvest and the rising sun, Stone Henge, Salisbury, England, UK, August.

Ingo Arndt / Zebra (Equus quagga) portrait, ears back standing in the rain, Masai Mara Game Reserve, Kenya