Espen Bergersen / Close-up of Walrus (Odobenus rosmarus) with broken tusk looking around while hauled out on beach, surrounded by other walruses, Sarstangen, Svalbard, Norway, August.

Espen Bergersen / Walruses (Odobenus rosmarus) resting in sea beside beach and all facing the shore, Sarstangen, Svalbard, Norway, Arctic Ocean, August.

Neil Aldridge / Brownheaded parrot (Poicephalus cryptoxanthus) climbing halfway out of nest in hollow tree stump and looking around, Letaba River, Limpopo Province, South Africa.

Lewis Jefferies / Amazon green kingfisher (Chloroceryle amazona) perched on branch next to shoreline and looking around before exiting frame, Corcovado National Park, Costa Rica.

Lewis Jefferies / Three-toed sloth (Bradypus sp.) mother and juvenile resting in a tree. The young animal looks round and down towards the camera. Corcovado National Park, Costa Rica.

Manuel Gracia / Garden dormouse (Eliomys quercinus) looking out at the edge of a hollow log. Then the animal disappears into its burrow. Seville, Spain. Controlled Conditions.

Manuel Gracia / Garden dormouse (Eliomys quercinus) inside a hollow log. The animal turns its head and looks at the camera. Seville, Spain. Controlled Conditions.

Manuel Gracia / Iberian lynx (Lynx pardinus) juvenile male sat scratching its neck. Near to Donana National Park, Seville province, Spain. Endangered.

Manuel Gracia / Iberian mongoose / Egyptian mongoose (Herpestes ichneumon) looking around and hunting for food, near Donana National Park, Sevilla, Spain.

Simon Littlejohn / Iberian lynx (Lynx pardinus) male laying down and grooming itself on boulder, Andujar National Park, Jaen province, Andalusia, Spain, August.

Neil Aldridge / Pearl-spotted owl (Glaucidium perlatum) looking around while perched in a woodland, Okavango Delta, Botswana.

Neil Aldridge / Fallow deer (Dama dama) female eaing, Moccas Park National Nature Reserve, Herefordshire, UK. October.