Danny Green / Hazel Dormouse (Muscardinus avellanarius) hibernating amongst leaves and acorns. Captive. Leicestershire, UK, October.

Edwin Giesbers / Female Orang Utan (Pongo pygmaeus) sitting, holding two young. One is her own offspring, the other was rejected by its birth mother, and so this female has adopted it. Both young are 3 months old.Capt...

Wild Wonders of Europe / Lundgre / Sperm whales (Physeter macrocephalus) resting, Pico, Azores, Portugal, June 2009. BOOK & WWE OUTDOOR EXHIBITION.

Heike Odermatt / Walrus (Odobenus rosmarus), Svalbard, Norway

Danny Green / Polar bear (Ursus maritimus) sleeping in snow. Churchill, Manitoba, Canada, November.

Nick Garbutt / King penguin (Aptenodytes patagonicus), two sleeping on snow. Grytviken, South Georgia. March.

Neil Anderson / Red squirrel (Sciurus vulgaris), two curled up asleep in drey inside nest box. Nest of lichen and Pine needles. Highlands, Scotland, UK. Medium repro only.

Clay Bolt / Blue-banded bee (Amegilla sp) males sleeping on stem. Halmahera, North Maluku, Indonesia.

Sven Zacek / Ural owl (Strix uralensis) perched in tree sleeping, viewed through a fence, Estonia.

John Chan / Anna's Hummingbird (Calypte anna) chick, sleeping in nest, Southern California, USA, March.

Matthew Maran / Red fox (Vulpes Vulpes) resting curled up close up, North London, England UK

Eric Baccega / Chimpanzee female (Pan troglodytes schweinfurthii) sleeping in a nest built in a tree, Kibale National Park, Uganda, January.