Mark MacEwen / Broad snouted caiman (Caiman latirostris) baby in mothers mouth being carried from nest, Sante Fe, Argentina, February

Mark Carwardine / Great white shark (Carcharodon carcharias) underwater, Guadalupe Island, Mexico (North Pacific)

David Shale / Fang Tooth {Anoplogaster cornuta} close-up of head showing teeth, from the Mid-Atlantic Ridge, 2600m

Anup Shah / Nile crocodile holding newly hatched young in mouth {Crocodylus niloticus} Kenya

David Shale / Deep sea Anglerfish {Himantolophus sp} female with lure projecting from head to attract prey, Atlantic ocean. Anglerfish have small poorly developed eyes but detect movement and prey through a well de...

Doug Perrine / Great white shark jaws open at surface {Carcharodon carcharias} South Africa (Non-ex).

David Shale / Deep sea Anglerfish {Melanocoetus sp} female with lure projecting from head to attract prey. Atlantic ocean

Anup Shah / Celebes / Black crested macaque (Macaca nigra) sub-adult male yawning, Tangkoko National Park, Sulawesi, Indonesia.

Mark Carwardine / Great white shark (Carcharodon carcharias) underwater, Guadalupe Island, Mexico (North Pacific)

Christophe Courteau / Gelada Baboon (Theropithecus gelada) dominant male threat display, lip curl, Simien NP, Ethiopia, 3000m altitude

Anup Shah / Mature male gelada (Theropithecus gelada) fighting head-on, upper lip curled back revealing teeth. Simien Mountains National Park, Ethiopia.

Solvin Zankl / Dragonfish (Melanostomias melanops) - deep sea specimen from 2000m depth, nr Cape Verde Islands, North Atlantic

Solvin Zankl / Viperfish (Chauliodus sloani) - deep sea specimen from Portugal

Steven David Miller / Australian freshwater / Johnstone's crocodile (Crocodylus johnsoni) with fish in mouth, a scrap from a fisherman, Lake Kununurra, Western Australia, July

Steven David Miller / Australian freshwater / Johnstone's crocodile (Crocodylus johnsoni) with damaged upper jaw in shallow water waiting for a scrap from a fisherman, Lake Kununurra, Western Australia, July

Erlend Haarberg / Norway lemming (Lemmus lemmus) calling on spring snow, Vauldalen, Norway, May

Hanne & Jens Eriksen / Dromedary / Arabian camel (Camelus dromedarius) close-up profile of face showing teeth, in desert, UAE, December. Not available for ringtone/wallpaper use.

Alex Mustard / 2020VISION / Old male Grey seal (Halichoerus grypus) with mouth wide open showing worn teeth, Lundy Island, Bristol Channel, England, UK, May. 2020VISION Book Plate.

Mark Bowler / Common Squirrel Monkey (Saimiri sciureus ssp. macrodon) in tree, calling, Peru, captive

Todd Mintz / Lemon shark (Negaprion brevirostris) at surface, Bahamas, Caribbean

Linda Pitkin / 2020VISION / Atlantic wolf fish (Anarhichas lupus) in a rock crevice, St Abbs (St Abbs and Eyemouth Voluntary Marine Reserve), Berwickshire, Scotland, UK, August 2011

Nick Garbutt / Adult male Hippopotamus (Hippopotamus amphibius) posturing in agressive 'yawn' behaviour, Luangwa River, South Luangwa National Park, Zambia, November

Nick Garbutt / Adult male Hippopotamuses (Hippopotamus amphibius) posturing in aggressive 'yawn' behaviour, Luangwa River, South Luangwa National Park, Zambia, November. Digital composite (two frames stitched togeth...

Jeff Rotman / Close up of mouth and teeth of Red Sea needlefish (Tylosurus choram) Red Sea, Egypt

Juergen Freund / Great barracuda (Sphyraena barracuda) West New Britain, Papua New Guinea

Juergen Freund / Great barracuda (Sphyraena barracuda) with Teira batfish (Platax teira) in background, Kimbe Bay, West New Britain, Papua New Guinea.

Andy Rouse / Portrait of a Mountain Gorilla (Gorilla beringei) with mouth wide open. Rwanda, Africa

Juergen Freund / Whitemargin stargazer (Uranoscopus sulphureus) half hidden in the sand. Lembeh Strait, North Sulawesi, Indonesia

Andy Rouse / Grizzly Bear (Ursus arctos horribilis) thrashing a large caught salmon. Katmai, Alaska, USA, August.

Fiona Rogers / Bornean Orang-utan (Pongo pygmaeus wurmbii) mature male 'Tom' yawning head portrait. Camp Leakey, Tanjung Puting National Park, Central Kalimantan, Borneo, Indonesia, June 2010. Rehabilitated and rele...

Luiz Claudio Marigo / Jaguar (Panthera onca palustris) in water with Yacare Caiman (Caiman yacare), its teeth around the back of the prey's neck. Piquiri River, The Pantanal wetlands of Mato Grosso State, Brazil, October....

Alex Mustard / 2020VISION / Grey seal (Halichoerus grypus) shows its teeth in a playful moment, Lundy Island, Bristol Channel, England, UK, May

Florian Möllers / Golden snub-nosed monkey (Rhinopithecus roxellana qinlingensis) adult male yawning showing canine teeth, Zhouzi Nature Reserve, Qinling mountains, Shaanxi, China. April 2006

Anup Shah / Bornean Orangutan (Pongo pygmaeus wurmbii) sub-adult male 'Pan' yawning - head portrait. Camp Leakey, Tanjung Puting National Park, Central Kalimantan, Borneo, Indonesia. June 2010. Rehabilitated and...

Anup Shah / Nile crocodile (Crocodylus niloticus) emerging from the Mara River - wide angle perspective, Masai Mara National Reserve, Kenya. August 2009.

Edwin Giesbers / Konik Wild Horse (Equus ferus caballus) yawning. The Netherlands, November.

Edwin Giesbers / Two Konik Wild Horse (Equus ferus caballus) interacting. The Netherlands, November.

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) catching salmon in river, Kamchatka, Far east Russia, August

Fergus Gill / Greylag goose (Anser anser) calling at dawn with its breath showing as a cloud of steam. Serrated tomia (the equivalent of teeth) are visible in its beak. Scotland, Dec .

Orsolya Haarberg / Eurasian beaver (Castor fiber) portrait, Telemark, Norway, June

Orsolya Haarberg / Eurasian beaver (Castor fiber) sniffing, Telemark, Norway, June

Anup Shah / African Lion (Panthera leo) head portrait of juvenile male, showing teeth in aggressive display, Masai Mara National Reserve, Kenya. April

Anup Shah / Hippopotamus (Hippopotamus amphibius) males fighting in pool, Masai Mara National Reserve, Kenya. February

Anup Shah / Hippopotamus (Hippopotamus amphibius) males fighting in pool, Masai Mara National Reserve, Kenya. February

Anup Shah / Hippopotamus (Hippopotamus amphibius) males fighting in pool, Masai Mara National Reserve, Kenya. February

Anup Shah / Hippopotamus (Hippopotamus amphibius) males fighting in pool, Masai Mara National Reserve, Kenya. February

Anup Shah / Nile crocodile (Crocodylus niloticus) attacking a Thomson's gazelle (Eudorcas thomsonii) as it crosses the Mara River. Masai Mara National Reserve, Kenya, October 2009

Anup Shah / Nile crocodile (Crocodylus niloticus) attacking a Thomson's gazelle (Eudorcas thomsonii) as it crosses the Mara River. Masai Mara National Reserve, Kenya, October 2009

Anup Shah / Nile crocodile (Crocodylus niloticus) attacking a Wildebeest (Connochaetes taurinus) as it crosses the Mara River. Masai Mara National Reserve, Kenya, October 2009

Andy Rouse / Mountain gorilla (Gorilla beringei) youngster with bad teeth in Susa group, Parc National des Volcans, Rwanda

Edwin Giesbers / Clouded leopard (Neofelis nebulosa) head portrait, yawning, captive

Kevin Schafer / Two Amazon river dolphins / Botos (Inia geoffrensis) swimming underwater in flooded rainforest, one with beak open, Rio Negro, Amazonia, Brazil, July

Alex Mustard / Female Grey seal (Halichoerus grypus) mouthiing the camera lens, Lundy Island, Devon, England, UK. July

Alex Mustard / Male Grey seal (Halichoerus grypus) mouths the camera lens, Lundy Island, Devon, England, UK. North East Altantic Ocean. July

Alex Mustard / Lemon shark (Negaprion brevirostris) in shallow water with reflection at the surface. Little Bahama Bank, Bahamas.

Alex Mustard / Lemon shark (Negaprion brevirostris) in shallow water at the surface, split level. Little Bahama Bank, Bahamas. West Atlantic Ocean.

Alex Mustard / Great white shark (Carcharodon carcharias) portrait, Guadalupe Island, Mexico, Pacific Ocean.

Alex Mustard / Male Great white shark (Carcharodon carcharias) showing scars from hunting, Guadalupe Island, Mexico, Pacific Ocean.

Alex Mustard / Lemon shark (Negaprion brevirostris) at the surface, split level. Little Bahama Bank, Bahamas. West Atlantic Ocean.

Bryan and Cherry Alexander / Close up of Narwhal (Monodon monoceros) in water showing its ivory tooth, Northwest Greenland.

Alex Hyde / Fosa / Fossa (Cryptoprocta ferox) male snarling, dry deciduous forest, Kirindy Forest, Western Madagascar, IUCN vulnerable species. Not available for ringtone/wallpaper use.

Edwin Giesbers / European Brown Bear (Ursus arctos) head portrait, with mouth open, captive.

Bence Mate / Jacare / Yacare caiman (Caiman crocodilus yacare) with young armadillo prey ib its jaws. Pantanal, Brazil. WINNER: Eric Hosking Award portfolio image 3/6 - Wildlife Photographer of the Year 2010

Angelo Gandolfi / Head portrait of a Grey Wolf (Canis lupus) captive.

Ann & Steve Toon / Nile crocodile (Crocodylus niloticus) with jaws wide open, Kruger National Park, South Africa

Jeff Rotman / Great White Shark (Carcharodon carcharias) surfacing with mouth open, Dyer Island, South Africa, Atlantic Ocean.

Jeff Rotman / Great White shark (Carcharodon carcharias) surfacing with mouth open, Dyer Island, South Africa, Atlantic Ocean.

Jeff Rotman / Jewel Grouper / Coral hind (Cephalopholis Miniata) with mouth open, Red Sea, Egypt

Edwin Giesbers / Head portrait of Sumatran tiger (Panthera tigris sumatrae) with face half cast in shadow, with aggressive expression, captive

Piper Mackay / Head portrait of Coyote (Canis latrans) yawning, Bolsa Chica wetlands, Huntington Beach, California, USA

Neil Lucas / Weddell seal {Leptonychotes weddellii} mother with pup on ice, pup yawning, Antarctica

Paul Hobson / Water vole (Arvicola terrestris) Peak District, Derbyshire, UK

Nick Garbutt / Adult male Fosa (Crytoprocta ferox) yawning, on deciduous forest floor. Kirindy Forest, western Madagaascar.

Philip Dalton / Common zebra (Equus quagga) swimming across the Mara River on migration, Masai Mara GR, Kenya

Philip Dalton / Nile Crocodile (Crocodylus niloticus) grabbing Common Zebra (Equus burchellii) as it swims across Mara river during migration, Masai Mara GR, Kenya

Wild Wonders of Europe / Sá / Diamond lizardfish (Synodus synodus) with mouth open showing teeth, Deserta Grande, Desertas Islands, Madeira, Portugal, August 2009

Doug Perrine / Close up of teeth and mouth of Salmon shark {Lamna ditropis} captive, Prince William Sound, Alaska, USA (digitally edited)

Theo Allofs / Celebes Black Macaque (Macaca nigra) dominant male, Sulawesi, Indonesia

Andy Rouse / Nile crocodile (Crocodylus niloticus) chasing Wildebeest (Connochaetes taurinus) during migration crossing, Masai Mara, Kenya, Africa

David Shale / Midwater Bristlemouth fish {Sigmops elongatum} night, 188 - 507m, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Fangtooth (Anoplogaster cornuta) portrait, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Deepsea Dragonfish {Eustomias monodactylus} with bioluminescent lure, from between 498 and 805m, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Lizard fish (Bathysaurus ferox) head portrait, from 2750m / 9022ft, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Viper fish {Chauliodus sloani}, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Head of Lancetfish {Alepisaurus brevirostris} from Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Angler fish Melanocetus murrayi, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Angler fish (Melanocetus murrayi) Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Angler fish {Linophryne sp} from the Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Angler fish (Melanocetus murrayi) Mid-Atlantic Ridge, North Atlantic Ocean

Mark Bowler / Mandrill (Mandrillus sphinx) male showing aggression, captive

Andy Rouse / European Red Fox (Vulpes vulpes) yawning, resting in snow, UK, captive

Steven Kazlowski / Polar bear (Ursus maritimus) playing with wing mirror and looking through window of a tundra buggy, 1002 coastal plain of the Arctic National Wildlife Refuge, Alaska, October 2005

Steven Kazlowski / Polar bear (Ursus maritimus) looking through window of a tundra buggy, with paws against the glass, 1002 coastal plain of the Arctic National Wildlife Refuge, Alaska, October 2005

Steven Kazlowski / Polar bear (Ursus maritimus) trying to bite window of a tundra buggy, with paws against the glass, 1002 coastal plain of the Arctic National Wildlife Refuge, Alaska, October 2005

Steven Kazlowski / Polar bear (Ursus maritimus) looking into tundra buggy window, 1002 coastal plain of the Arctic National Wildlife Refuge, Alaska, October 2005