John Cancalosi / Western diamondback rattlesnake (Crotalus atrox). Arizona, USA

Pete Oxford / Panther chameleon, tongue extended to catch prey {Furcifer pardelis} Madagascar

Jason Smalley / Close-up of Slug {Arion ater rufus} feeding on leaf, UK

Pete Oxford / Flap necked chameleon catching fly with tongue, Africa

John Downer / Fish-eye view of African elephant's open mouth, Zimbabwe

Staffan Widstrand / Polar Bear (Ursus maritimus) portrait with blue tongue sticking out, Svalbard, Norway

Staffan Widstrand / Polar Bear (Ursus maritimus) face portrait with bear yawning showing blue tongue, Svalbard, Norway

Ingo Arndt / Common Water Monitor (Varanus salvator) swimming, native to southern Asia

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

Mark Carwardine / Jaguar (Panthera onca) grooming, resting beside Cuiaba River, Pantanal, Brazil *Digitally removed wound on Jaguar's face

Mark Carwardine / Jaguar (Panthera onca) grooming, resting beside Cuiaba River, Pantanal, Brazil *Digitally removed wound on Jaguar's face

Mark Carwardine / Amazonian manatee {Trichechus inunguis} feeding at surface, Endangered, Captive, Instituto Nacional de Pesquisas da Amazonas, Manaus, Brazil

Mark Carwardine / Malayan sun bear (Ursus malayanus) with long tongue sticking out, captive, near Phnom Penh, Cambodia, Endangered or threatened species (Vulnerable)

Mark Carwardine / Javan langur / leaf monkey (Trachypithecus / Presbytis auratus) sticking out tongue, Endangered, captive, from Indonesia, Bristol Zoo Not available for ringtone/wallpaper use.

Mark Carwardine / New Caledonia crested / Guichenot's giant / Eyelash gecko (Rhacodactylus ciliatus) using tongue to wipe its eye clean, captive, from South Province, New Caledonia. Thought to be extinct but rediscover...

Mark Carwardine / Mangrove / Yellow-ringed cat snake with tongue out {Boiga dendrophila} captive, from Asia

Mark Carwardine / Mangrove / yellow-ringed cat snake with tongue out {Boiga dendrophila} captive, from Asia

Bert Willaert / Juvenile Ladder snake (Rhinechis scalaris) coiled up and tongue flicking, Spain, April.

Bert Willaert / Portrait of a juvenile Ladder snake (Rhinechis scalaris) tongue flicking, Spain, April.

Bert Willaert / Horseshoe whip snake (Coluber hippocrepis) coiled up and tongue flicking. Extremadura, Spain, April.

Richard Du Toit / Hippopotamus (Hippopotamus amphibius) sticking out tongue, Kruger National Park, South Africa

Christophe Courteau / African lioness {Panthera leo} at waterhole, drinking. Okavango delta, Botswana.

Christophe Courteau / African lionesses {Panthera leo} at waterhole, drinking. Okavango delta, Botswana.

Christophe Courteau / African lion male at waterhole {Panthera leo}. Okavango delta, Botswana

Christophe Courteau / African lions {Panthera leo} drinking at waterhole. Moremi GR, Okavango delta, Botswana.

Hanne & Jens Eriksen / Arabian chameleon (Chamaeleo arabicus) tongue extended hunting insect, Oman, November

Tony Phelps / Spotted Rock Snake (Lamprophis guttata) Scenting air with tongue. Pringle Bay, Western Cape, South Africa.

Chris Mattison / Giant day gecko (Phelsuma grandis), cleaning eye with tongue, captive, occurs Madagascar.

Chris Mattison / Giant day gecko (Phelsuma grandis), cleaning eye with tongue, captive, occurs Madagascar

Andy Rouse / Red fox (Vulpes Vulpes) cub and mother licking nose with tongue, UK, taken in controlled conditions, August

LYNN M. STONE / Golden Retriever in backyard garden; Illinois, USA

Paul Williams / Toco toucan (Ramphastos toco) feeding, catching insects with bony tongue, Pantanal, Matogrossense National Park, Brazil

Michael D. Kern / Santa Catalina Island rattlesnake (Crotalus catalinensis) captive, from Santa Catalina, Gulf of California, critically endangered

Michael D. Kern / Philippine temple pitviper (Tropidolaemus philippensis) captive, from Philippines

Mark Raycroft / Airedale Terrier (Canis familiaris)

Philippe Clement / Female Great spotted woodpecker (Dendrocopos major) showing tongue whilst looking for fallen nuts on the ground on forest floor, Belgium, April

Daniel Heuclin / Western Hognose Snake (Heterodon nasicus) tasting air with its tongue. Endemic to western North America and Mexico.

Bertie Gregory / 2020VISION / Young Red fox (Vulpes vulpes) drinking from pond in garden, Bristol, UK, January

Roland Seitre / Malayan / Javan / Sunda Pangolin (Manis javanica) using long tongue to drink water. Mulhouse Zoo, France. Endemic to Thailand, Burma, Indonesia and other South-East Asian localities. Endangered due to...

Roland Seitre / Spectacled Bear (Tremarctos ornatus) climbing tree, with tongue out. Captive. Chaparri reserve, Chiclayo, Lambayeque, Peru, 2010.

Roland Seitre / Violet Sabrewing Hummingbird (Campylopterus hemileucurus) on hummingbird feeder, showing long 'proboscis' tongue. Person watching, taking photo behind. Captive. La Paz Waterfall Gardens, Poas, Costa R...

Daniel Heuclin / Alligator snapping turtle (Macroclemys temmincki) fishing by luring a fish with the vermiform, worm-like, tongue, USA, captive

Daniel Heuclin / Alligator snapping turtle (Macroclemys temmincki) fishing by luring a fish with the vermiform, worm-like tongue, USA, captive

Roland Seitre / Spix's Macaw (Cyanopsitta spixii) male and female pair touching beaks, captive, critically endangered species, from Brazil

Martin Willis / Stump-tailed Skink (Trachydosaurus rugosus) in threat display with extended tongue, Darling Range, Western Australia, Australia

Martin Willis / Yellow-spotted Monitor (Varanus panoptes) sensing with tongue, Winton, Queensland, Australia

Richard Du Toit / African Lion (Panthera leo) sub-adult, Kgalagadi Transfrontier Park, Botswana

Laurie Campbell / Male Adder (Vipera berus) basking on rock with tongue flicking, Northumberland National Park, England, May

Donald M. Jones / Red Fox (Vulpes vulpes) pup licking its nose, Mission Valley, western Montana

Donald M. Jones / American Bison (Bison bison) bull tasting air for receptive females, National Bison Range, Moise, Montana

Mark Hughes / Tui (Prosthemadera novaeseelandiae) poking out tongue, Karori Wildlife Sanctuary, Wellington, New Zealand

ZSSD / Komodo Dragon (Varanus komodoensis) flicking tongue, native to Indonesia

Petra Wegner / Australian Shepherd, red-tri, sitting in front of woman with tongue out. Model released

Petra Wegner / Australian Shepherd, red-tri, standing on back legs begging with tongue hanging out.

Petra Wegner / Australian Shepherd, red-tri, head portrait with tongue out.

Petra Wegner / Elo, bitch, 13 month puppy, sitting portrait with tongue out.

Petra Wegner / Elo, bitch, 13 month puppy, head portrait with tongue out.

Petra Wegner / Elo, bitch, 13 month puppy, lying down with tongue out.

Petra Wegner / German Shepherd / Alsatian, puppy, 4 months, head portrait with tongue out.

Petra Wegner / Cavalier King Charles Spaniel, tricolour, 12 months, sitting in wild flower meadow, with tongue out.

Petra Wegner / Ogar Polski / Polish Hound, short haired females, standing with tongue out.

Petra Wegner / Ogar Polski / Polish Hound, short haired, lying down with tongue out.

Petra Wegner / Chihuahua, longhaired, standing looking up with tongue out.

Petra Wegner / Cavalier King Charles Spaniel, blenheim on left and black-and-tan, right, with a small yellow ball.

Petra Wegner / Cavalier King Charles Spaniel, black-and-tan, sitting portrait with tongue out.

Petra Wegner / Australian Shepherd, red-tri, sitting with tongue hanging out.

Petra Wegner / Briard / Berger de Brie, lying down with tongue out.

Petra Wegner / Briard / Berger de Brie, lying down with tongue out.

Petra Wegner / Briard / Berger de Brie, puppy, 12 month, lying down head with tongue out.

Petra Wegner / German Shepherd / Alsatian, puppy, 4 months, sitting with tongue out.

Petra Wegner / German Shepherd / Alsatian, puppy, 4 months, head profile with tongue out.

Petra Wegner / German Shepherd / Alsatian, puppy, 4 months, sitting with tongue out.

Petra Wegner / Elo, bitch, 11 months, sitting in wild flower meadow.

Petra Wegner / Ogar Polski / Polish Hound, short haired bitch, head portrait with tongue out.

Petra Wegner / Ogar Polski / Polish Hound, short haired females, standing with tongue out.

Petra Wegner / Ogar Polski / Polish Hound, short haired male, lying down portrait with tongue out.

Petra Wegner / Elo, bitch, 11 months, standing in wild flower meadow with tongue out.

Petra Wegner / Briard / Berger de Brie, puppy, 12 month, lying down with tongue out.

Brent Stephenson / Wrybill (Anarhynchus frontalis) yawning and showing its tongue. Manawatu Estuary, Manawatu, New Zealand, September.

Chien Lee / Large-blotched Python (Antaresia stimsoni) flicking tongue, Western Australia, Australia

Chien Lee / Sabah Bamboo Pitviper (Popeia sabahi), Sarawak, Borneo, Malaysia

Chien Lee / Komodo Dragon (Varanus komodoensis) walking with tongue extended, Nusa Tenggara, Indonesia

Mark Hamblin / 2020VISION / Mountain hare (Lepus timidus) with partial winter coat and tongue sticking out, Scotland, UK, April

Mark Hamblin / 2020VISION / Mountain hare (Lepus timidus) in winter coat, sitting in snow, with tongue poking out, Scotland, UK, February

Kerstin Hinze / Grey seal (Halichoerus grypus) with tongue out, on beach, Dune of Helgoland, North Sea, Germany,

John Cancalosi / Eyelash Palm-pitviper (Bothriechis / Bothrops schlegeli) coiled in strike pose with tongue extended. Costa Rica. Captive.

John Cancalosi / Side-striped Palm-pitviper (Bothriechis lateralis) coiled in strike pose with tongue extended. Costa Rica. Captive.

John Cancalosi / Green / Common Iguana (Iguana iguana) head in profile with mouth open, showing tongue. Costa Rican tropical rainforest.

Hanne & Jens Eriksen / Saw scaled viper (Echis carinatus) with tongue out, captive, Oman, February

Ben Osborne / African lion (Panthera leo) juvenile washing paws, Botswana, taken on location for BBC Planet Earth series, 2005

Anup Shah / Caracal (Caracal caracal) kitten resting in grass, licking its lips, six months, Masai Mara National Reserve, Kenya, August

James Christensen / Ecuadorian Toad-headed Pit-viper (Bothrocophias campbelli) held up by photographer's assistant, Shannon Bowley, Mindo, western slope of Andes, Ecuador

Mark Raycroft / Dachshund (Canis familiaris) male running

Mark Carwardine / Water Monitor (Varanus salvator) tasting the air with its tongue. Borneo, Indonesia.

Sandesh Kadur / Jerdon's Pit-Viper (Protobothrops jerdonii) with tongue exposed, Ziro valley, Arunachal Pradesh, India

Ernie Janes / Grass snake (Natrix natrix) on heathland, UK