Silke Arndt / Western rattlesnake (Crotalus viridis viridis), threat display, South Dakota, USA, September.

Roy Mangersnes / Polar bear (Ursus maritimus) foot sticking out of water while diving for food, Spitsbergen, Svalbard, Norway, August

Sven Zacek / Tail of a Pine Marten (Martes martes) sticking out from a black woodpecker hole as it forages for eggs and chicks. Estonia, Europe, May.

Andy Rouse / 2020VISION / European river otter (Lutra lutra) head sticking out of water, river, Dorset, UK, November

Rolf Nussbaumer / Head portrait of Gulf Coast Ribbon snake (Thamnophis proximus orarius) covered in duckweed and swimming, with tongue protruding, Fennessey Ranch, Refugio, Corpus Christi, Coastal Bend, Texas Coast, U...

Wild Wonders of Europe / Lundgren / Clouds around Pico, the highest mountain in Portugal, sticking out through a loayer of clouds, Azores, Portugal, June 2009

Wild Wonders of Europe / López / Baltic sea with posts sticking out of water at sunset, Latvia, June 2009

Wild Wonders of Europe / Dörr / Red Lake and Suhardul Mara-massif (1,507m) with reflections and tree stumps sticking out of water, Cheile Bicazului-Hasmas National Park, Carpathian, Transsylvania, Romania, October 2008

Wild Wonders of Europe / Peltomäki / Three Dalmatian pelicans (Pelecanus crispus) on dead wood sticking out of Lake Kerkini, Macedonia, Greece, February 2009

David Hall / Crocodile snake eel (Brachysomophis henshawi), head sticking out of gravel. Pantar, Alor Archipelago, Indonesia.

Sean Crane / Alaska Moose (Alces alces gigas) bull sticking out tongue, Chugach State Park, Alaska

Lynn M. Stone / Bernese mountain dog, male sitting amongst flowers in dune, Tampa Bay, Florida, USA.

Lynn M. Stone / Bichon frise beside Colorado blue columbine (Aquilegia coerulea) flowers. Old Lyme, Connecticut, USA. May.

Lynn M. Stone / Bichon frise standing on rock amongst Rhododendron flowers. Haddam, Connecticut, USA. May.

Karine Aigner / Black-tailed jackrabbit (Lepus californicus) sticking tongue out, Texas, USA, July.

Alex Mustard / Close up portrait of small, golden variety of a female Roughhead blenny (Acanthemblemaria aspera), photographed against the blue water, sticking out from its home in a tube on a coral reef. East End,...

Five Films / Close up of a Rufous-breasted hermit (Glaucis hirsutus) perched on a nectar feeder sticking out its tongue and flicking its tail, Atlantic Forest, Reserva Ecologica de Guapiacu, Rio de Janeiro, Brazil...

Mary McDonald / Mountain gorillas (Gorilla beringei beringei) baby sticking out tongue, Volcanoes National Park / Parc National des Volcans, Rwanda.

Sebastian Kennerknecht / Tule Elk (Cervus elaphus nannodes) bull sticking out tongue, Point Reyes National Seashore, California

Pascal Kobeh / Bonapart's / Napoleon snake eel (Ophichthus bonaparti) head sticking out of sand, Sulu Sea, Philippines

Pascal Kobeh / Barred sand conger (Ariosoma fasciatum or Poeciloconger fasciatus) head sticking out of burrow in sea floor, Sulu Sea, Philippines

Fiona Rogers / Mountain gorilla (Gorilla gorilla beringei) juvenile yawning and sticking out tongue, member of 'Humba' group. Virunga National Park, Democratic Republic of Congo, March.

Cyril Ruoso / Juvenile Bonobo (Pan paniscus) with mouth wide open sticking out tongue during mimicry game, Lola Ya Bonobo Sanctuary, Democratic Republic of the Congo. Endangered Species.

Paul Hobson / Weasel (Mustela nivalis) head sticking out of a snow hole, Sheffield, England, UK.

Claudio Contreras / Gulf coast ribbon snake (Thamnophis proximus orarius) in water with tongue extended, Laredo Borderlands, Texas, USA. April

Yukihiro Fukuda / Feral domestic rabbit (Oryctolagus cuniculus) mother greeting baby sticking head out of burrow, Okunojima Island, also known as Rabbit Island, Hiroshima, Japan.

Yukihiro Fukuda / Feral domestic rabbit (Oryctolagus cuniculus) mother greeting baby sticking head out of burrow, Okunojima Island, also known as Rabbit Island, Hiroshima, Japan.

Denis-Huot / Okapi (Okapia johnstoni) feeding, with tongue exteneded. Captive at zoo. Occurs in Ituri Rainforest, Democratic Republic of the Congo.

Andy Rouse / Mountain Gorilla (Gorilla beringei beringei) baby sticking tongue out, Rwanda, Africa.

TOM MANGELSEN / Male Resplendent quetzal (Pharomachrus mocinno) sticking its head out of its nest hole, El Triunfo Biosphere Reserve, Sierre Madre de Chiapas, Mexico.

Ingo Arndt / Grizzly Bear (Ursus arctos horribilis) sticking out tongue, Lake Clark National Park, Alaska

Aflo / Black naped terns (Sterna sumatrana mathewsi) on rock sticking out of sea, Miyakojima, Miyako Island, Okinawa Prefecture, Japan

Wild Wonders of Europe / Geslin / Common terns (Sterna hirundo) on branches sticking out of water, Lake Belau, Moldova, June 2009

Wild Wonders of Europe / Geidemark / Donkey's head sticking out from pile of hay it is carrying, Lake Prespa National Park, Albania, June 2009

Wild Wonders of Europe / Muñoz / Large rocks sticking out of sea, Traigh Ghearadha beach, north east Lewis, Outer Hebrides, Scotland, UK, June 2009.

John Cancalosi / Corn snake (Pantherophis guttatus) feeding on a mouse, feet sticking out of mouth, captive

Steven David Miller / Brown booby (Sula leucogaster) standing on rock sticking out of water, Great Barrier Reef, Australia

Wild Wonders of Europe / Liodden / Ice formation sticking out of water, Spitsbergen, Svalbard, Norway, June 2009

Wild Wonders of Europe / Dörr / Tree stumps sticking out of water in Red Lake with reflections, Cheile Bicazului-Hasmas National Park, Carpathian, Transsylvania, Romania, October 2008

Wild Wonders of Europe / Smit / European pond turtle (Emys orbicularis) on tree trunk sticking out of water, Gornje Podunavlje Special Nature Reserve, Serbia, June 2009

Wild Wonders of Europe / Dörr / Landscape reflected in Red Lake with tree stumps sticking out of water, Cheile Bicazului-Hasmas National Park, Carpathian, Transsylvania, Romania, October 2008

Wild Wonders of Europe / Dörr / Tree stumps sticking out of water, with reflections, Red Lake, Cheile Bicazului-Hasmas National Park, Carpathian, Transsylvania, Romania, October 2008

Wild Wonders of Europe / Munier / Reindeer (Rangifer tarandus) shed antlers sticking out of snow, Forollhogna National Park, Norway, September 2008

Wild Wonders of Europe / Widstrand / Rocks sticking out of the ground surrounded by flowering French / Spanish lavender (Lavandula stoechas) La Serena, Extremadura, Spain, April 2009

Wild Wonders of Europe / Widstrand / Flowering French / Spanish lavender (Lavandula stoechas) in landscaepe with rocks sticking out of the ground, La Serena, Extremadura, Spain, April 2009

Wild Wonders of Europe / Biancarelli / Branch sticking out of water with trees reflected in Proscansko Lake, Upper Lakes, Plitvice Lakes NP, Croatia, October 2008

Donald M. Jones / White-tailed Antelope Squirrel (Ammospermophilus leucurus) sticking out its tongue, southern Nevada

Vincent Grafhorst / Meerkat (Suricata suricatta) sticking its head out of its burrow, Kgalagadi Transfrontier Park, Botswana

Jouan & Rius / Eastern grey kangaroo (Macropus giganteus), female with joey's legs sticking out of her pouch, Burrum Coast National Park, Queensland, Australia

Konrad Wothe / Grizzly Bear (Ursus arctos horribilis) sticking out its tongue, North America

Konrad Wothe / Grizzly Bear (Ursus arctos horribilis) sticking out its tongue, North America

Luciano Candisani / Amazonian Manatee (Trichechus inunguis) sticking head out of water, Amazon, Brazil

Mark Raycroft / Miniature Pinscher (Canis familiaris) standing on rocks with tongue sticking out side of mouth

Doug Perrine / Black finned snake eel {Ophichthus melanochir} head sticking out of sand, Mabul Island, Borneo, Malaysia

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) adult female sticking out tongue, late fall, Katmai National Park, Alaska

Pete Oxford / Wedge-capped / Weeping capuchin (Cebus olivaceus) in rainforest tree, sticking out tongue. Iwokrama Reserve, Guyana.

Richard Du Toit / Nile Crocodile (Crocodylus niloticus) sticking head out of water, Kruger National Park, South Africa

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) sticking out its tongue, Katmai National Park, Alaska

Mike Wilkes / Black crake (Amaurornis flavirostra) perched on branch sticking out of water, amongst waterlilies, The Gambia, May

Robin Chittenden / Portrait of Galloway cattle (Bos taurus) sticking out tongue. Dumfries & Galloway, UK, May.

Vincent Grafhorst / Meerkat (Suricata suricatta) sticking its head out of its burrow, Kgalagadi Transfrontier Park, Botswana

Andy Trowbridge / Jewelled gecko (Naultinus gemmeus) resting on trunk of New Zealand fushia tree (Fuchsia excorticata) with tongue poking out, Banks Peninsula, Canterbury, South Island, New Zealand.

Andrew Parkinson / Mountain hare (Lepus timidus) in winter coat, licking its nose, Cairngorms National Park, Scotland, UK. February.

Andrew Parkinson / Mountain hare (Lepus timidus) in winter coat, licking its nose, Cairngorms National Park, Scotland, UK. March.

Andrew Parkinson / Mountain hare (Lepus timidus) in winter coat, sitting in snow hole licking its nose, Cairngorms National Park, Scotland, UK. February.

Andrew Parkinson / Mountain hare (Lepus timidus) in winter coat, sitting in snow, poking tongue out while grooming, Cairngorms National Park, Scotland, UK. February.

Joel Sartore / Photo Ark / Eastern bobcat (Lynx rufus rufus) with tongue out, head portrait, Alexandria Zoological Park, Louisiana, USA. Captive.

Joel Sartore / Photo Ark / Eastern bobcat (Lynx rufus rufus) with tongue out, portrait, Alexandria Zoological Park, Louisiana, USA. Captive.

Joel Sartore / Photo Ark / California alligator lizard (Elgaria multicarinata multicarinata) male, with tongue out, head portrait, Sulphur Creek Nature Center, California, USA. Captive.

Andy Trowbridge / Jewelled gecko (Naultinus gemmeus) resting on trunk of New Zealand fushia tree (Fuchsia excorticata) cleaning eye with tongue, Banks Peninsula, Canterbury, South Island, New Zealand.

George Sanker / Black bear (Ursus americanus) feeding on Rose hips (Rosa sp.) on rocky cliff side, Yellowstone National Park, Wyoming, USA. September.

George Sanker / Black bear (Ursus americanus) feeding on Rose hips (Rosa sp.) on rocky cliff side, Yellowstone National Park, Wyoming, USA. September.

David Tipling / Pair of Brown hares (Lepus europaeus) sitting face to face, one poking out its tongue, Norfolk, UK. February.

Tui De Roy / Red-footed booby (Sula sula) chick head sticking out of bush, Genovesa Island, Galapagos Islands, Ecuador.

Kristel Richard / Donkey standing alongside a Kerry bog pony, stallion, a rare breed, sticking his tongue out, County Kerry, Republic of Ireland. April.

John Cancalosi / Chocolate Border collie dog (Canis familiaris) running through grass meadow, mouth open, Maryland, USA.

John Cancalosi / Chocolate Border collie dog (Canis familiaris) running through grass meadow, mouth open, Maryland, USA.

Eric Baccega / Nile monitor lizard (Varanus niloticus) with tongue sticking out, Conkouati-Douli National Park, Republic of Congo, Africa.

Franco Banfi / Injured dorsal fin of Blue whale sticking out of the surface (Balaenoptera musculus brevicauda). This may be the pygmy sub-species of blue whale, Balaenoptera musculus. Mirissa, Sri Lanka, Indian Ocea...