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.

Juergen Freund / Spectacled flying fox (Pteropus conspicillatus) babies or bubs wrapped in cloth in the nursery at Tolga Bat Hospital, North Queensland, Australia, November 2012

Juergen Freund / Spectacled flying fox (Pteropus conspicillatus) babies or bubs wrapped in cloth and teats in mouths ready for feeding in the nursery at Tolga Bat Hospital, North Queensland, Australia, November 2012

Suzi Eszterhas / Bengal Tiger (Panthera tigris tigris) six week old cub on sleeping mother at den, Bandhavgarh National Park, India

Suzi Eszterhas / Bengal Tiger (Panthera tigris tigris) five week old cub resting on sleeping mother at den, Bandhavgarh National Park, India

Mark Taylor / Two cute tabby kittens, Stanley and Fosset, 7 weeks, sleeping in a hammock.

Andy Rouse / African lioness (Panthera leo) resting with head on another at sunrise, Masai Mara National Reserve, Kenya

Juergen Freund / Spectacled flying fox (Pteropus conspicillatus) babies swaddled up in cloth ready to sleep, Tolga Bat Hospital, Atherton, North Queensland, Australia. January 2008.

Juergen Freund / Spectacled flying fox (Pteropus conspicillatus) babies swaddled in cloth ready to sleep, Tolga Bat Hospital, Atherton, North Queensland, Australia. January 2008.

Jean E. Roche / Flock of Greater flamingos (Phoenicopterus ruber) sleeping in water, Camargue, Southern France, September 2008

Andy Rouse / 2020VISION / Mute Swan (Cygnus olor) resting, Shapwick NNR, Avalon Marshes, Somerset Levels, UK, February

Klaus Echle / Red fox (Vulpes vulpes) resting in woodland, sleeping, Black Forest, Germany, Winner of Fritz Polking portfolio prize , GDT 2011 competition

Dr. Axel Gebauer / Red panda (Ailurus fulgens), cub 4 days old in breeding den, captive

Laurie Campbell / Common / Harbour Seal (Phoca vitulina) bottling / sleeping upright in water and moored in bed of sea thong weed, Islay, Scotland, April

Inaki Relanzon / Koala (Phascolarctos cinereus) curled up sleeping in tree, Great Otway National Park, Victoria State, Australia.

Chadden Hunter / Southern elephant seal (Mirounga leonina) close up of sleeping individual, South Georgia. Taken on location for BBC Frozen Planet series, 2008

David Woodfall / Bull Grey Seal (Halichoerus grypus) asleep in pool with reflection of bombing range sign in pool. Donna Nook, UK, November.

David Woodfall / Bull Grey Seal (Halichoerus grypus) asleep in pool with reflection of bombing range sign in pool. Donna Nook, UK, November.

LYNN M. STONE / Sleeping mixed-breed piglet in straw, Maple Park, Illinois, USA

Terry Whittaker / 2020VISION / Hazel dormouse (Muscardinus avellanarius), Kent, UK. Members of Kent Mammal Group conduct monthly dormouse survey, torpid dormouse hibernating in nest box in coppiced woodland, November 2011. Did you...

Andy Rouse / Polar Bear (Ursus maritimus) sleeping on pack ice. Wide angle / fish-eye shot. Svalbard, Norway, September.

David Kjaer / Common Dormouse (Muscardinus avellanarius) sleeping on leaves. Bentley Wood, Wiltshire, May.

Andrew Parkinson / Coots (Fulica atra) resting at dawn. Derbyshire, UK, March.

Jeff Rotman / Close up of eye of Giant Pacific Octopus (Enteroctopus dofleini), British Columbia, Canada, Pacific Ocean.

Dave Watts / Green ringtail possum (Pseudocheirus archeri) female with baby in pouch, looking down from tree, Queensland, Australia, November

Luiz Claudio Marigo / People taking photographs of a Brown-throated Three-toed Sloth (Bradypus variegatus) in Parque Centenario, downtown Cartagena de Indias city, Magdalena Department, Colombia, February 2011.

Brent Stephenson / Crabeater Seal (Lobodon carcinophaga) hauled out on ice. Pleneau Island, Antarctica, January.

Jane Burton / Yellow Labrador retriever, new born puppy sleeping.

Matthew Maran / Sea otter (Enhydra lutris) resting at the sea surface with paws in the air. Barkley Sound, Vancouver Island, Canada, August.

Andy Rouse / Mountain Gorilla (Gorilla beringei) adult sleeping with infant. Rwanda, Africa

Fiona Rogers / Bornean Orang-utan (Pongo pygmaeus wurmbii) female 'Tutut' cradling her sleeping baby 'Thor' aged 8-9 months head portrait. Camp Leakey, Tanjung Puting National Park, Central Kalimantan, Borneo, Indon...

Luiz Claudio Marigo / Two Giant Otter / Giant Brazilian Otter (Pteronura brasiliensis) sunbathing on a tree trunk. The Pantanal wetlands of Mato Grosso State, Brazil, October.

Danny Green / 2020VISION / Red Fox (Vulpes vulpes) resting amongst autumn leaves, Leicestershire, England, UK, September

Anup Shah / Bornean Orangutan (Pongo pygmaeus wurmbii) female 'Tutut' sitting with her sleeping baby 'Thor' aged 8-9 months. Camp Leakey, Tanjung Puting National Park, Central Kalimantan, Borneo, Indonesia. July...

Fergus Gill / Grey seal pup (Halichoerus grypus) sleeping on a windswept beach. Scotland, Nov

Andy Sands / Dormouse (Muscardinus avellanarius) asleep in old Blackcap nest. Captive. UK, September.

Mark Carwardine / Common shelduck (Tadorna tadorna) ducklings huddled together, Slimbridge, Gloucestershire, UK, June

David Woodfall / Tawny owl (Strix aluco) roosting in hotel chimney. Romania, October 2010

Markus Varesvuo / Curlew sandpiper (Calidris ferruginea) sleeping, Finland, August

John Cancalosi / Grey Wolf (Canis lupus) head portrait of male, sleeping in snow, Captive

Edwin Giesbers / Orang utan (Pongo pygmaeus) baby sleeping in the arms of an adult, Semengoh Nature reserve, Sarawak, Borneo, Malaysia, Endangered

Petra Wegner / Cavalier King Charles Spaniel, three puppies resting on cushion bed, blenheim and tricolour, 5 weeks

Petra Wegner / British Shorthair Cat, kitten, silver-shaded, sleeping

Alex Mustard / A group of Florida manatees (Trichechus manatus latirostrus) sleeping in the afternoon at Three Sisters Spring. Crystal River, Florida, USA. Manatees sleep on the bottom of the spring, floating up per...

Alex Mustard / A group of Florida manatees (Trichechus manatus latirostrus) sleeping in the afternoon at Three Sisters Spring. Manatees sleep on the bottom of this shallow spring, occasionally rising to the surface...

Mark Taylor / Two baby Hedgehogs (Erinaceus europaeus) portrait, helpless and with eyes shut.

Claudio Contreras / Northern elephant seal (Mirounga angustirostris) close-up of weaner / juvenile sleeping, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, April

Claudio Contreras / Northern elephant seal (Mirounga angustirostris) weaner sleeping at the bottom of a tide pool, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, April

Edwin Giesbers / Wild boar (Sus scrofa) piglets sleeping, the Netherlands, April

Bryan and Cherry Alexander / Polar bear (Ursus maritimus) getting covered in snow as he sleeps. Cape Churchill, Canada.

Ann & Steve Toon / Common dormouse (Muscardinus avellanarius)torpid, in captive breeding programme, UK

Edwin Giesbers / Brown-lipped / Grove / Banded snails (Cepaea nemoralis) on plant stem, Menorca, Balearic Islands, Spain, Europe

Pete Oxford / Close up of Snow Goose (Chen caerulescens) with head tucked into wing, Slimbridge Wildfowl and Wetlands Trust, SW England, UK captive

Aflo / Two Japanese macaques (Macaca fuscata) sleeping with awake baby, in snow, Jigokudani, Nagano, Japan

Aflo / ic-02802 Two domestic cats sleeping with heads close together {Felis catus}

Aflo / ic-02801 View of heads of two domestic cats sleeping close together {Felis catus}

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) female and pup nuzzling, Galapagos Islands, Ecuador

Edwin Giesbers / Young Western lowland gorilla (Gorilla gorilla gorilla) sleeping in mothers arms. Endangered species. Captive; Apenheul zoo; the Netherlands.

John Waters / Banded Mongoose (Mungos mungo) group resting together in shade during heat of mid-day, Mweya Lodge, Queen Elizabeth National Park, Uganda, E. Africa

Wild Wonders of Europe / de la L / Walruses (Obdobenus rosmarus) lying on beach, Prins Karls Forland, Svalbard, Norway, July 2008

Wild Wonders of Europe / della Ferrera / Tornjak mountain sheep dog resting near herd of sheep in a partially flooded area, Livanjsko Polje (karst plateau) Bosnia and Herzegovina, May 2009

Wild Wonders of Europe / Liodden / Sled dog (Canis familiaris) sleeping in snow, Spitsbergen, Svalbard, March 2009

David Tipling / Burrowing owl (Athene cunicularia) resting, Salton Sea, California, USA, April

Wild Wonders of Europe / López / Spotted souslik (Spermophilus suslicus) sitting with eyes shut, Werbkowice, Zamosc, Poland, May 2009

Paul Hobson / Mute swan (Cygnus olor) cygnet sleeping on parents back between wings, Dorset, UK

Paul Hobson / Three Mute swan (Cygnus olor) cygnets on parents back, Dorset, UK

Paul Hobson / Mute swan (Cygnus olor) cygnet sleeping on parents back between wings, Dorset, UK

Mark Taylor / Two kittens asleep under a scarf.

Wild Wonders of Europe / Novák / Sanderling (Calidris alba) flock roosting, Bhl, Germany, April 2009

Wild Wonders of Europe / Unterthiner / Whooper swan (Cygnus cygnus) sleeping, with head tucked under wing, Lake Tysslingen, Sweden, March 2009

Wild Wonders of Europe / Unterthiner / Two Whooper swans (Cygnus cygnus) sleeping, with head tucked under wings, Lake Tysslingen, Sweden, March 2009

Wild Wonders of Europe / Novák / Sheep with lamb, Westerhever, Germany, April 2009

Anup Shah / Gelada baboon (Theropithecus gelada) group huddled together, resting and grooming in the early morning, Simien Mountains National Park, Ethiopia, November

Wild Wonders of Europe / Novák / Large flock of Bramblings (Fringilla montifringilla) roosting in trees with other in flight, Ldersdorf, Austria, February 2009

Wild Wonders of Europe / Novák / Large flock of Bramblings (Fringilla montifringilla) roosting in trees, Ldersdorf, Austria, February 2009

Wild Wonders of Europe / Novák / Large flock of Bramblings (Fringilla montifringilla) roosting in trees, Ldersdorf, Austria, February 2009 WWE BOOK PLATE. Wild Wonders kids book.

Wild Wonders of Europe / Novák / Large flock of Bramblings (Fringilla montifringilla) roosting in trees, Ldersdorf, Austria, February 2009

Wild Wonders of Europe / Munier / Five Muskox (Ovibos moschatus) lying down, in mist, Dovrefjell National Park, Norway, February 2009

Andrew Parkinson / Coot (Fulica atra) forming an almost perfect circle as it roosts at dawn, Derbyshire, UK, March

Andy Rouse / Grizzly bear (Ursus arctos horribilis) resting by river, Alaska (non-ex)

Yukihiro Fukuda / Japanese macaques (Macaca fuscata) huddled together sleeping in a tree at night, full moon, Jigokudani, Joshinetsu Kogen NP, Nagano, Japan

Wild Wonders of Europe / O Haarberg / Long-tailed duck (Clangula hyemalis) resting, Mvatn, Iceland, June 2008

Orsolya Haarberg / Northern gannet (Morus bassanus) colony, Seabird cliff, Langanes peninsula, Iceland, July 2008

Andy Rouse / African elephant (Loxodonta africana) very young calf (2 weeks) sleeping, Samburu GR, Kenya

Andy Rouse / Galapagos green turtle (Chelonia mydas agassisi) resting in water, sleeping in mangrove forest, Galapagos

Wild Wonders of Europe / Arndt / Schreiber's long fingered bat (Miniopterus schreibersi) colony roosting, Grotta Monte Majore, Gennargentu NP, Sardinia, Italy, November 2008

Wild Wonders of Europe / Arndt / Schreiber's long fingered bat (Miniopterus schreibersi) colony roosting, Grotta Monte Majore, Gennargentu NP, Sardinia, Italy, November 2008 WWE OUTDOOR EXHIBITION

Juan Carlos Munoz / Red panda {Ailurus fulgens} resting on branch in snow, China, captive

Thomas Marent / Crowned Lemur (Eulemur coronatus) female with sleeping baby, Ankarana Special Reserve, Madagascar

Michael Pitts / Looking up at Three toed / Pale throated sloth {Bradypus tridactylus} swimming across mangrove channel, South America

Solvin Zankl / Meerkat (Suricata suricatta) juvenile peering out from under resting group of adults, South Africa

Anup Shah / Hippopotamus {Hippopotamus amphibius} resting with young, Masai Mara GR, Kenya

Jeff Rotman / Lyretail Hogfish (Bodianus anthioides) sleeping in sponge at night. Egypt, Red Sea.

Rolf Nussbaumer / Ocelot {Felis pardalis} captive, leg and paw of female resting, Welder Wildlife Refuge, Texas, USA