Danny Green / Hazel Dormouse (Muscardinus avellanarius) hibernating amongst leaves and acorns. Captive. Leicestershire, UK, October.
Mark MacEwen / Southern elephant seal (Mirounga leonina), two females sleeping. St Andrews Bay, South Georgia. October.
Alex Mustard / School of Oriental sweetlips (Plectorhinchus vittatus) gather tightly together as they rest during the day, with a Clown triggerfish (Balistoides conspicillum) and Midnight snappers (Macolor macularis...
Oliver Wright / Marbled white butterfly (Melanargia galathea) photographed in early morning light. Ledston, Yorkshire, June. Focus stacked image.
Oliver Wright / Portrait of a Emerald damselfly (Lestes sponsa) Yorkshire, August. Focus stacked image.
Oliver Wright / Portrait of a Common darter (Sympetrum striolatum) Yorkshire, July. Focus stacked image.
Jenny E. Ross / Polar bear (Ursus maritimus) cubs, age 2-3 months, in den, Wapusk National Park, Manitoba, Canada. March.
Danny Green / Arctic fox (Vulpes lagopus) cub resting. Hornstrandir Nature Reserve, Iceland, July.
Danny Green / Arctic fox (Vulpes lagopus) resting in snow. Hornstrandir Nature Reserve, Iceland, February.
Danny Green / Bengal tiger (Panthera tigris tigris) resting on track. Bandhavgarh National Park, India, December.
Danny Green / Bengal tiger (Panthera tigris tigris) male resting in undergrowth, portrait. Bandhavgarh National Park, India, December.
Tui De Roy / Alcedo giant tortoise (Chelonoidis vandenburghi), Alcedo Volcano, Isabela Island, Galapagos
Doug Perrine / Hawaiian green sea turtles (Chelonia mydas) crowding into a small seaside cavern to bask at sunset. Resting on shore is a behaviour that is very rare for sea turtles, except in Hawaii and the Galapago...
Ross Hoddinott / Four-spotted chaser (Libellula quadrimaculata) dragonflies resting on backlit reeds close to the water's edge, Broxwater, Cornwall, UK. May.
Andy Sands / Green veined white butterfly (Pieris napi) roosting on a Dog Violet flower, Hertofrdshire, England, UK, April - Focus Stacked
Guy Edwardes / Brown tent-making bats (Uroderma magnirostrum) roosting under a palm leaf, lowland rainforest, Costa Rica. November.
Shane Gross / Galapagos Sea Lion (Zalophus californianus wollebacki) resting on rocks at sunset on North Seymour Island, Galapagos, Ecuador. December.
Laurent Geslin / Red fox (Vulpes vulpes) cubs sleeping curled up together, Switzerland
Danny Green / Mountain hare (Lepus timidus) resting Cairngorms, Scotland, March
Alex Mustard / RF - Pod of Spinner dolphins (Stenella longirostris) cruise in formation over the sand of a lagoon while sleeping. Egypt. Red Sea (This image may be licensed either as rights managed or royalty free.)
Erlend Haarberg / Red fox (Vulpes vulpes), on spring snow, Vauldalen, Norway, April.
Danny Green / Ringed seal (Pusa hispida) resting on ice, reflected in water. Svalbard, Norway. July.
Danny Green / Reindeer (Rangifer tarandus) hunkering down in snow during blizzard. Svalbard, Norway, April.
Danny Green / Polar bear (Ursus maritimus) sleeping in snow. Churchill, Manitoba, Canada, November.
Danny Green / Polar bear (Ursus maritimus) female resting with cubs on glacier. Svalbard, Norway, July.
Danny Green / Polar bear (Ursus maritimus) and cubs resting on sea ice. Svalbard, Norway, July.
Danny Green / Polar bear (Ursus maritimus) resting in snow. Svalbard, Norway, July.
Alex Mustard / Green turtle (Chelonia mydas) resting on sea floor and two juvenile Golden trevally (Gnathanodon speciosus). Marsa El Shouna, Marsa Alam, Egypt.
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.
Fred Olivier / Close-up of a Northern sea otter (Enhydra lutris kenyoni) sleeping, with paws over eyes, Kachemak Bay, Alaska, USA.
Bernard Castelein / Coquerel's sifaka (Propithecus coquereli) in tree, relaxing, Ankarafantsika National Park, Madagascar
Alex Mustard / Common seahorse (Hippocampus kuda) female wrapping her prehensile tail around piece of wood on the seabed. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.
John Chan / Anna's Hummingbird (Calypte anna) chick, sleeping in nest, Southern California, USA, March.