Jami Tarris / Japanese Macaque (Macaca fuscata) in hot spring, Jigokudani, Nagano, Japan

Ingo Arndt / Tussock moth caterpillars mass together for defense. Comoe NP, Ivory Coast {Lymantriidae}. This behaviour tricks predators into thinking the caterpillars are a single, much larger, organism.

Cyril Ruoso / Bonobo (Pan paniscus) young in day nest, Democratic Republic of the Congo

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) juvenile male, five years old, Gombe National Park, Tanzania

Wim van den Heever / Lion (Panthera leo) male with scars photographed with side-lit spot light at night. Greater Kruger National Park, South Africa, April.

Juan Carlos Munoz / Close up of horse wearing bridle, Sierra de Gredos, Avila, Castile and Leon, Spain.

Wim van den Heever / Lion (Panthera leo) male in darkness, Okavango Delta, Botswana.

Ole Jorgen Liodden / Polar bear (Ursus maritimus) standing on ice floe, looking at camera. Svalbard, Norway. August.

Thomas Marent / Bonobo (Pan paniscus), Lola Ya Bonobo Sanctuary, Democratic Republic of the Congo

Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) infant male 'Gizmo' aged 2 years, portrait. Gombe National Park, Tanzania.

Cyril Ruoso / Common woolly monkey (Lagothrix lagotricha) reaching forward, Ikamaperou Sanctuary, Amazon, Peru.

Sven Zacek / Eider ducks (Somateria mollissima) males reflected in a small pond, Longyearbyen, Svalbard, Norway. June.