Jane Burton / Chocolate Retriever puppy, Mocha, asleep wearing a Father Christmas hat.
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Jane Burton / Yellow Labrador Retriever puppy wearing a Father Christmas hat, asleep on a festive toy bone.
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Jane Burton / Chocolate Retriever puppy, Mocha, asleep on a Father Christmas hat.
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Jane Burton / Westie x Cavalier puppies asleep in a Father Christmas hat.
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Jane Burton / Golden Retriever puppy asleep wearing a Father Christmas hat.
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Jane Burton / Retriever puppy asleep wearing a Father Christmas hat.
01202019
Jane Burton / White German Shepherd Dog puppy asleep wearing a Father Christmas hat.
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Jane Burton / Golden Retriever puppypy asleep under Father Christmas hat.
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Jane Burton / Retriever puppy asleep wearing a Father Christmas hat.
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Jane Burton / Yellow Labrador Retriever puppypy asleep wearing a Father Christmas hat.
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Jane Burton / Yellow Labrador Retriever puppy asleep wearing a Father Christmas hat.
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Michael & Patricia Fogden / African Lion (Panthera leo) cub asleep, Etosha National Park, Namibia
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DAVID TIPLING / Dormouse asleep in nestbox {Muscardinus avellanarius} Kent U
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Michael Pitts / Sleeping Hawaiian monk seal on beach {Monachus schauinslandi}, Midway Atoll
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John Cancalosi / Barbary ape asleep on wall with baby {Macaca sylvanus} Gibraltar
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David Pike / Polar bear asleep with very small cubs {Ursus maritimus} Watchee lodge area Canada
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David Pike / Northern Red fox subspecies C in snow {Vulpes vulpes schrencki} Tsurui Mura Japan
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Neil Aldridge / African lion (Panthera leo) male lying in the shade and falling asleep, Okavango Delta, Botswana.
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Neil Aldridge / Leopard (Panthera pardus) female sleeping in fallen tree. The animal wakes up briefly and falls back asleep. Okavango Delta, Botswana.
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Neil Aldridge / Leopard (Panthera pardus) female looks round and then falls asleep in long grass, Okavango Delta, Botswana.
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Neil Aldridge / Leopard (Panthera pardus) female asleep in long grass. The animal wakes up and looks round. Okavango Delta, Botswana.
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Manuel Gracia / Whiskered tern (Chlidonias hybrida) chick falling asleep whilst standing in nest, Donana National Park, Sevilla, Spain.
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Harry Collins / Three-toed sloth (Bradypus) hanging upside down in a tree. Then the animal falls asleep. Costa Rica.
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Harry Collins / Three-toed sloth (Bradypus) asleep and hanging upside down in a tree. Then the animal wakes up. Costa Rica.
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Manuel Gracia / A close-up shot a Garden dormouse's (Eliomys quercinus) face. The can be seen breathing while it is asleep in its nest during hibernation. Seville, Spain. Controlled Conditions.
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Manuel Gracia / Garden dormouse (Eliomys quercinus) hibernating. The animal is curled up asleep in its nest. Seville, Spain. Controlled Conditions.
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Doug Gimesy / Grey-headed flying fox (Pteropus poliocephalus) trying to fall asleep but it is being disturbed by a fly. The animal is twitching its ears. Myuna Wetland, Doveton, Victoria, Australia.
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Joel Sartore / Photo Ark / Sand cat (Felis margarita harrisoni) female falling asleep, North Carolina Zoo. Captive.
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Joel Sartore / Photo Ark / Sand cat (Felis margarita harrisoni) female closing eyes and falling asleep, North Carolina Zoo. Captive.
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Nigel Cattlin / White pig sow asleep with several young piglets, aged 4-5 days, trying to suckle, Dorset, UK. November.
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Joel Sartore / Photo Ark / Margay (Leopardus wiedii pirrensis) juvenile lying down and falling asleep, Quito Zoo. Captive.
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Joel Sartore / Photo Ark / Visayan leopard cat (Prionailurus bengalensis rabori) licking and falling asleep, Avilon Zoo. Captive.