Heike Odermatt / Brunnich's Guillemot (Uria lomvia) nesting colony on cliff, Alkefjellet, Hinlopen Strait, Svalbard, Norway

Danny Green / Brunnich's guillemot (Uria lomvia) colony in mist, many birds in flight and nesting on cliffs. Svalbard, Norway, July 2018.

Nick Upton / Male Thick-legged flower beetle (Oedemera nobilis), with a Pyramidal orchid (Anacamptis pyramidalis) pollinium attached to its head, nectaring on Common hogweed flowers (Heracleum sphondylium), Wiltsh...

Paul Bertner / Thick-tailed Scorpion (Tityus sp), under UV light, Sani Lodge, Ecuador

Yashpal Rathore / Indian pangolin (Manis crassicaudata) foraging for food, Kanha National Park, Madhya Pradesh, India.

Paul Bertner / Thick-tailed Scorpion (Tityus sp), Cat Tien National Park, Vietnam

Ingo Arndt / Thick billed ravens interacting {Corvus crassirostris} Simien NP, Ethiopia, East Africa

Pal Hermansen / Brunnich's guillemot (Uria lomvia) taking off from water, Alkefjellet. Svalbard, Norway, July.

Neil Aldridge / Leopard (Panthera pardus) cub peering out from thick vegetation in the heart of Chief's Island, Okavango Delta. Botswana

Richard Du Toit / African Lion (Panthera leo) male in thick bush, Kruger National Park, South Africa

Olga Kamenskaya / Man looking through transparent ice (1m thick) on lake surface to see diver below. Lake Baikal, Russia, March 2008. Model released.

Markus Varesvuo / Brunnich´s guillemot (Uria lomvia) in flight, summer plumage, Norway July 2004

Markus Varesvuo / Grey Partridge (Grey Partridge) buried in thick snow, Liminka, Finland, February 2004

Roy Mangersnes / Brunnich's guillemot (Uria lomvia) in flight low over sea, Spitsbergen, Svalbard, Norway, June.

Roy Mangersnes / Brunnich's guillemot (Uria lomvia) diving into sea, Spitsbergen, Svalbard, Norway, July.

Roy Mangersnes / Brunnich's guillemots (Uria lomvia) on sea, Spitsbergen, Svalbard, Norway, July.

Roy Mangersnes / Brunnich's guillemots (Uria lomvia) on sea, Spitsbergen, Svalbard, Norway, July.

Olga Kamenskaya / Car on thick Lake Baikal ice, Lake Baikal, Siberia, Russia, March. Property released.

Dong Lei / Jungle Crow (Corvus macrorhynchos) perched on tree branch with rainbow, Shejila mountain, Qinghai-Tibetan Plateau, Tibet, China. July.

Alan Murphy / Brunnich's Guillemot (Uria lomvia) flying, Alaska

Ann & Steve Toon / Black hairy thicktailed scorpion (Parabuthus villosus), Namib Desert, Namibia, April

Chris Mattison / Marico Gecko (Pachydactylus mariquensis latirostris). Namaqualand, Northern Cape, South Africa.

Chris Mattison / Marico Thick-toed Gecko (Pachydactylus mariquensis latirostris). Namaqualand, Northern Cape, South Africa.

Piotr Naskrecki / Thick-tailed Scorpion (Tityus sp) under ultraviolet light, Suriname

Piotr Naskrecki / Thick-tailed Scorpion (Tityus sp), Suriname

Peter Cairns / 2020VISION / Two Scots pine trees (Pinus sylvestris) silhouetted at sunset, Glen Affric, Scotland, UK, October 2012. Did you know? The bark of a Scots pine tree can be up to 5 centimetres thick.

Staffan Widstrand / Brunnich's Guillemot (Uria lomvia) stretching wings and calling on small ice floe, Svalbard, Norway, July

Staffan Widstrand / Brunnich's Guillemot (Uria lomvia) on sea surface, Svalbard, Norway July

Juan Carlos Munoz / Bearded vulture (Gypaetus barbatus) chasing Thick-billed Raven (Corvus crassirostris) in flight. Simien National Park, Ethiopia, Africa.

Erlend Haarberg / Arctic fox (Alopex lagopus) in thick winter fur jumping a river in spring, Hornstrandir, West Fjords, Iceland, April

Carol Walker / Cowboy galloping through snow, wearing thick sheepskin coat, Wyoming, USA, February 2012, model released

Vladimir Medvedev / Nesting colony of Thick-billed Murre / Brunnich's Guillemot (Uria lomvia) on St. Jonah's island, Sea of Okhotsk, Far East Russia, July

Carol Walker / Mustang / wild horse, yearling cremello colt Claro in thick winter coat, stretching, McCullough Peak herd, Wyoming, USA, February 2008

MYN / Piotr Naskrecki / Long legged fly (Condylostylus sp) portrait, Concord, Massachusetts, USA, June. meetyourneighbours.net project

Andrew Parkinson / 2020VISION / Great crested grebe (Podiceps cristatus) adult emerges from a thick mist into dawn sunlight, Derbyshire, UK, April. 2020VISION Book Plate.

Ole Jorgen Liodden / Brunnich's Guillemot (Uria lomvia) flying between misty colony cliffs. Spitsbergen, Svalbard, August.

Ole Jorgen Liodden / Brunnich's Guillemot (Uria lomvia) cliff colony seen through snow. Spitsbergen, Svalbard, July.

Andrew Parkinson / Mute swan (Cygnus olor) adult emerges serenely from a thick mist into dawn sunlight, Derbyshire, UK, May.

Frederique Olivier / Killer whale (Orcinus orca) amongst thick pack ice, Antarctica. Taken on location for the BBC series, Frozen Planet.

Jeff Rotman / Matses Indian men hold a thick-bodied, 18-foot long Anaconda (Eunectes notaeus) that they killed during a night hunt. Amazon, Peru, November 2005.

Lassi Rautiainen / Grey wolf (Canis lupus) in woodland in thick snow jumping up at eagle perched on dead tree stump overhead, Finland, December

Wild Wonders of Europe / della Ferrera / Pedunculate oak (Quercus robur) covered in thick stems of Common ivy (Hedera helix) Hutovo Blato Nature Park, Bosnia and Herzegovina, May 2009

Wild Wonders of Europe / Liodden / Brunnich's guillemots (Uria lomvia) on ice, Spitsbergen, Svalbard, June 2009 WWE BOOK Wild Wonders kids book.

Jouan & Rius / Street covered in thick ice, Akureyri, North Iceland 2005

Philippe Clement / The Cocksdorp lighthouse shining at night in thick fog, Texel, the Netherlands, April 2009

Juan Carlos Munoz / Red fox {Vulpes vulpes} walking through thick snow, Gran Paradiso NP, Valsavarenche, Aosta valley, Italian alps

Yukihiro Fukuda / Japanese macaque / Snow monkey {Macaca fuscata} 8-month-old monkey walking through thick snow on hind legs to keep hands warmer, Jigokudani, Nagano, Japan

Ross Hoddinott / Thick-legged flower beetle {Oedemera nobilis} on Corn marigold {Chrysanthemum segetum}, Cornwall. UK. Winner of Seasons category of the BWPA 2011 competition

Richard Du Toit / Thick-tailed Scorpion (Buthidae) walking on sand dune and casting a shadow, Namib-Naukluft National Park, Namibia

Flip Nicklin / Polar Bear (Ursus maritimus) paw showing black pads and thick fur, Canada

Rod Williams / Thick billed parrot, native to Mexico. Endangered species

Heike Odermatt / Brunnich's Guillemot (Uria lomvia) nesting colony on cliff, Alkefjellet, Hinlopen Strait, Svalbard, Norway

Melvin Grey / Senegal thicknee (Burhinus senegalensis), leucistic. Gambia, Africa.

Fabio Pupin / Ocellated thick-toed gecko, (Pachydactylus geitje) with regenerated tail, South Africa, February . Non-ex.

Fabio Pupin / Southern rough gecko, (Pachydactylus formosus), South Africa, February . Non-ex.

Fabio Pupin / Bibron's thick-toed gecko, (Chondrodactylus bibronii), Little Namaqualand, South Africa, February . Non-ex.

Fabio Pupin / Western Cape thick-toed gecko, (Pachydactylus labialis), Little Namaqualand, South Africa, February . Non-ex.

Fabio Pupin / Namib web-footed gecko, (Pachydactylus rangei), Namib desert, Namibia, February . Non-ex.

Andy Rouse / Brunich's Guillemot (Uria iomvia) flying in front of old glacier, Svalbard, Norway.

Rick Price / Beach stone-curlew (Esacus magnirostris) standing on exposed reef. Montgomery Reef, Doubtful Bay, The Kimberley, Western Australia.

Dong Lei / Large-billed crow (Corvus macrorhynchos) in front of prayer flags, Mt Qomolangma National Park, Qinghai Tibet Plateau, China.

Loic Poidevin / Spotted thick-knee (Byrhinus capensis) in bush, Masai Mara, Kenya.

Staffan Widstrand / Water thick-knee (Burhinus vermiculatus) portrait, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Doug Gimesy / Fiordland penguin (Eudyptes pachyrhynchus) heads back up stream to its nest in the temperate rain forests on Fiordland southwest coast. North of Haast, Westland District, South Island, New Zealand. Oc...

Doug Gimesy / Fiordland penguin (Eudyptes pachyrhynchus) heads back up stream to its nest in the temperate rainforests on Fiordland southwest coast, South Island, New Zealand. October.

Nick Upton / Male Thick-legged flower beetle (Oedemera nobilis), with a Pyramidal orchid (Anacamptis pyramidalis) pollinium attached to its head, nectaring on Common hogweed flowers (Heracleum sphondylium), Wiltsh...

Nick Upton / Female Thick-legged flower beetle (Oedemera nobilis) and a Meadow brown butterfly (Maniola jurtina) nectaring on Greater knapweed flowers (Centaurea scabiosa) in a chalk grassland meadow, Wiltshire, E...

Nick Upton / Female Thick-legged flower beetle (Oedemera nobilis) and a Meadow brown butterfly (Maniola jurtina) nectaring on a Greater knapweed flower (Centaurea scabiosa) in a chalk grassland meadow, Wiltshire,...

Nick Upton / Juvenile Goldenrod spider (Misumena vatia) camouflaged on a Common hogweed (Heracleum sphondylium) flowerhead, reacting to a nearby fly (Muscidae) and a Thick-legged flower beetle (Oedemera nobilis),...

Rod Williams / A mating pair of conopid flies (Sicus ferrugineus), New Cross Cutting, Lewisham, England, June

Robin Chittenden / Great stone-curlew (Burhinus recurvirostris / Esacus recurvirostris) Sri Lanka.

Robin Chittenden / Great stone-curlew (Burhinus recurvirostris / Esacus recurvirostris) Sri Lanka.

Nick Upton / Stone curlews (Burhinus oedicnemus) group of four standing among volcanic rocks in steppe scrubland at dawn, Teguise Plain, Lanzarote, Canary Islands, February.

Nick Upton / Stone curlew (Burhinus oedicnemus) standing among volcanic rocks in steppe scrubland at dawn, Teguise Plain, Lanzarote, Canary Islands, February.

Thomas Marent / Thick-billed Euphonia (Euphonia laniirostris), Pereira, Colombia

Nick Upton / Male Thick-legged / Swollen-thighed flower beetle (Oedemera nobilis) feeding on nectar and pollen on a Meadow buttercup (Ranunculus acris) flower, England, UK. May.

Nick Upton / Researcher wearing thick gloves collecting Siberian flying squirrel (Pteromys volans) from trap prior to fitting radio collar. Muraka Forest Reserve, Lisaku, Estonia. April 2018. Model released.

Nick Upton / Thick-legged flower beetle / False blister beetle (Oedemera femoralis) male on Ivy (Hedera helix) flowers at night, Wiltshire, UK, September.

Nick Upton / Thick-legged hoverfly (Syritta pipiens) nectaring on Common fleabane (Pulicaria dysenterica), Dorset, UK, July.

Nick Upton / Thick / Toothed top shell (Phorcus lineatus), five exposed on rock at low tide. Cornwall, England, UK. September.

Staffan Widstrand / Muskox (Ovibos moschatus) feeding in autumn. Dovrefjell National Park, Norway. September.

Andy Sands / Bee killer fly (Myopa buccata) sitting in wait for passing Bee, Hertfordshire, England, UK, May. Focus Stacked Image

Piotr Naskrecki / Scorpion (Parabuthus transvaalicus) female carrying young, Gorongosa National Park, Mozambique

Piotr Naskrecki / Turner's Thick-toed Gecko (Pachydactylus turneri) foot pads showing scales which enable it to climb vertical surfaces, Gorongosa National Park, Mozambique

Karine Aigner / Thick-billed vireo (Vireo crassirostris) Cat Island, Bahamas.

Juergen Freund / Timelapse of fog covered landscape, with thick clouds passing through, Atherton Tablelands, North Queensland, Australia. 2018.

Alain Dragesco-Joffe / Spotted dikkop (Burhinus capensis) adult, Sahara, Niger.

Ashley Cooper / Passengers on Zodiaks off the Russian research vessel, AkademiK Sergey Vavilov an ice strengthened ship on an expedition cruise to Northern Svalbard in front of the Aalkefjellet, sea bird nesting clif...

Ashley Cooper / Passengers on Zodiaks off the Russian research vessel, AkademiK Sergey Vavilov an ice strengthened ship on an expedition cruise to Northern Svalbard in front of the Aalkefjellet, sea bird nesting clif...

Ashley Cooper / Passengers on Zodiaks off the Russian research vessel, AkademiK Sergey Vavilov an ice strengthened ship on an expedition cruise to Northern Svalbard, Norway, July.

Bernard Castelein / Fly (Physocephala rufipes), Klein Schietveld, Brasschaat, Belgium. August

Bernard Castelein / Senegal thick-knee (Burhinus senegalensis), Gambia.

Bernard Castelein / Senegal thick-knee (Burhinus senegalensis), Gambia.

Robin Chittenden / Thick-billed murre (Uria lomvia) and egg on cliff face, Iceland. June.

Rod Williams / Thick-headed Fly (Sicus ferrugineus) feeding on Bramble (Rubus) blossom, Brockley Cemetery, Lewisham, London, England, UK. May.

Sylvain Cordier / Brunnich's Guillemot (Uria lomvia) two in flight, Svalbard, Norway.