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

Michael D. Kern / Rhinoceros iguana (Cyclura cornuta) captive, from Hispaniola, Caribbean, Vulnerable species

Paul Harris / 2020VISION / Local resident Roy Peters holding two Adders (Vipera berus) male in foreground female behind, Caesar's Camp, Fleet, Hampshire, England, UK, May 2011. Model released.

Juergen Freund / Researchers Guido and Katja Westhoff work in a mobile lab in the bush. To handle the deadly Common death adder (Acanthophis antarcticus) Guido puts the head and upper portion of the snake in a plastic...

Juergen Freund / Researchers Guido and Katja Westhoff catching a highly venomous Common death adder (Acanthophis antarcticus) found 10 minutes into their group's evening road collection. The death adder ranks 9th out...

Juergen Freund / Common death adder (Acanthophis antarcticus) well camouflaged in its natural habitat. Queensland, Australia, February

Danny Green / 2020VISION / Adder (Vipera berus) coiled, basking on moss in the spring sunshine, Staffordshire, England, UK, April. Photographer quote: "OK so snakes are perhaps not as sexy as seals or foxes but I just can't get...

Pete Oxford / Snake charmer's Egyptian cobra (Naja haje) and African puff-adder (Bitis arietans arietans) Djemaa el-Fna (the square), Marrakech, Morocco, June 2009

Colin Varndell / Adder (Vipera berus) portrait coiled up, Powerstock Common nature reserve, Dorset, England, UK June

Andy Sands / Two male Adders (Vipera berus) fighting / dancing during mating season, Captive, UK

Edwin Giesbers / Portrait of female Adder (Vipera berus) in long grass, the Netherlands

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

Niall Benvie / MYN / Adder (Vipera berus) portrait, Kent, England, June

Tony Phelps / Puff adder (Bitis arietans) juvenile amongst succulent plants in karoo habitat, Little Karoo, South Africa

Solvin Zankl / Dwarf puff adder / Peringueys Sidewinding Adder (Bitis peringueyi) moving over the loose sand in typical mode of locomotion, Namib desert, Namibia)

Solvin Zankl / Dwarf puff adder / Peringueys Sidewinding Adder (Bitis peringueyi) hidden in sand of Namib desert, Namibia

Solvin Zankl / Dwarf puff adder / Peringueys Sidewinding Adder (Bitis peringueyi) moving over the loose sand in typical mode of locomotion, Namib desert, Namibia

Solvin Zankl / Dwarf puff adder / Peringueys sidewinding adder (Bitis peringueyi) camouflaged against sand, Namib desert, Namibia

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

Tony Phelps / Adder (Vipera berus) female with newborn baby, Surrey UK, April 2008

Tony Phelps / Adder (Vipera berus) female and new born baby, Surrey UK, April 2008

Tony Phelps / Adder (Vipera berus) adult female with new born baby, Surrey, UK, April 2008

Juergen Freund / Trunkfish / Longhorn cowfish {Lactoria cornuta}

David Shale / Portrait of Fangtooth {Anoplogaster cornuta} Atlantic

Andy Sands / Adder (Vipera berus) Male basking on log in spring, next to Celandine flowers, West Sussex, UK April

Jabruson / Close up of skin of Puff adder {Bitis arietans} Tsavo East NP, Kenya

Andy Sands / Female Adder {Vipera berus} close up of head of snake, Sussex, England

Geoff Simpson / Adder {Vipera berus}, female basking. Eastern Moors, Peak District NP.

David Shale / Fangtooth, bathypelagic fish (Anoplogaster cornuta), deep sea Atlantic ocean

Tony Phelps / Adder male guarding female in courtship {Vipera berus} Purbeck, Dorset, UK.

Tony Phelps / Female Adder tasting the air with tongue {Vipera berus} Purbeck Dorset UK 2000

Tony Phelps / Adder {Vipera berus} melanic / black form female with normal morph young. Dorset, UK

Geoff Simpson / Male Adder showing distinctive zig zag markings {Vipera berus}. Peak District NP, England UK

Tony Phelps / Male Adders 'dancing' in rivalry at beginning of breeding season, England, UK.

Andrew Cooper / Adder basking in sun along coast, Devon, UK

David Shale / Fangtooth deep sea fish, Atlantic ocean

Brian Lightfoot / Adder about to be trodden on, Scotland, UK

Chris Packham / Adder and car tyres.

Tony Phelps / Newborn Adder still in membrane {Vipera berus} Dorset, UK

Geoff Simpson / Adder female {Vipera berus} Peak District NP, UK Derbyshire

Tony Phelps / Extracting venom from Puff adder {Bitis arietans} at Liverpool school of tropical medicine, UK

Chris Mattison / Many-horned / Horned Puff Adder (Bitis cornuta). Springbok, South Africa, October.

Chris Mattison / Many-horned Adder (Bitis cornuta) curled up. Springbok, Northern Cape, South Africa.

Chris Mattison / Many-horned / Horned Puff Adder (Bitis cornuta). Port Nolloth, South Africa, October.

Chris Mattison / Many-horned / Horned Puff Adder (Bitis cornuta). Port Nolloth, South Africa, October.

Mark Carwardine / Rhinoceros iguana (Cyclura cornuta) captive, from Haiti and Puerto Rico, Caribbean

Georgette Douwma / Longhorn cowfish (Lactoria cornuta) Manado, North Sulawesi, Indonesia

Michael D. Kern / Smooth-scaled death adder (Acanthophis laevis) captive, from Indonesia and PNG

Michael D. Kern / Smooth-scaled death adder (Acanthophis laevis) captive, from Indonesia and PNG

Paul Harris / 2020VISION / Local resident Roy Peters holding two Adders (Vipera berus) female in foreground male behind, Caesar's Camp, Fleet, Hampshire, England, UK, May 2011. Model released.

Paul Harris / 2020VISION / Local resident Roy Peters holding two Adders (Vipera berus) female on right and male on left showing thickening at base of tail. Caesar's Camp, Fleet, Hampshire, England, UK, May 2011. Model released.

Paul Harris / 2020VISION / Local resident Roy Peters holding two Adders (Vipera berus) male in right hand and female in left hand, Caesar's Camp, Fleet, Hampshire, England, UK, May 2011. Model released.

Paul Harris / 2020VISION / Local resident Roy Peters holding two Adders (Vipera berus) found under sheet of corrugated iron, Caesar's Camp, Fleet, Hampshire, England, UK, May 2011. Model released.

Rod Williams / Rhinoceros iguana (Cyclura cornuta) head portrait, Dominican Republic, Haiti, vulnerable species. Captive.

Roland Seitre / Death Adder (Acanthophis antarcticus) being milked. Venom is extracted from the snake for medical and research purposes. Australian Reptile Park, Gosford, New South Wales.

Roland Seitre / Death Adder (Acanthophis antarcticus) being prepared for milking. Venom will be extracted from the snake for medical and research purposes. Australian Reptile Park, Gosford, New South Wales.

Roland Seitre / Rear detail of Marsupial treefrog (Gastrotheca cornuta) showing pouch of female, El Valle Amphibian Conservation Center, Panama, Central America

Roland Seitre / Marsupial treefrog (Gastrotheca cornuta) female, El Valle Amphibian Conservation Center, Panama, Central America

Laurie Campbell / Two female Adders (Vipera berus) peering out from beneath rock, Lammermuir Hills, Berwickshire, August

Adrian Davies / Adder's Tongue Fern (Ophioglossum vulgatum). UK, April.

Adrian Davies / Adder's Tongue Fern (Ophioglossum vulgatum). UK, April.

Georgette Douwma / Helmet Shell (Cassis cornuta). Manado, North Sulawesi, Indonesia.

Juergen Freund / Horned helmet conch snail (Cassis cornuta) feeding on by sucking out a Sand dollar, Palawan, Philippines, Indo-pacific.

Juergen Freund / Researcher Guido Westhoff working in a mobile lab in the bush. To handle the highly venomous Common death adder (Acanthophis antarcticus) he puts the head and upper portion of the snake in a plastic t...

Juergen Freund / Researcher Guido Westhoff extracting a tooth from the mouth of a highly venomous Common death adder (Acanthophis antarcticus). The death adder ranks 9th out of the top 10 most venomous snakes in the w...

Juergen Freund / Researcher Guido Westhoff handling a highly venomous Common death adder (Acanthophis antarcticus) to extract a tooth from its mouth. He works in a mobile lab in the bush. The death adder ranks 9th out...

Juergen Freund / Researcher Guido Westhoff handles a highly venomous Common death adder (Acanthophis antarcticus) to extract a tooth from its mouth. He works in a mobile lab in the bush. The death adder ranks 9th out...

Juergen Freund / Researcher Guido Westhoff catching a highly venomous Common death adder (Acanthophis antarcticus) found 10 minutes into his group's evening road collection. The death adder ranks 9th out of the top 10...

Juergen Freund / Researcher Guido Westhoff catching a highly venomous Common death adder (Acanthophis antarcticus) found 10 minutes into his group's evening road collection. The death adder ranks 9th out of the top 10...

Juergen Freund / Jurgen Freund photographing a highly venomous Death adder with his home-made video remote controlled camera. Queensland, Australia, February 2008

Juergen Freund / Common death adder (Acanthophis antarcticus) well camouflaged in its natural habitat, seen from above. Queensland, Australia, February

Juergen Freund / Common death adder (Acanthophis antarcticus) on sandy beach. Queensland, Australia, February

Colin Varndell / Adder's Tongue Fern (Ophioglossum sp.) Somerset, UK, May.

Georgette Douwma / Longhorn Cowfish (Lactoria cornuta). Rinca, Komodo National Park, Indonesia, October.

Colin Varndell / Adder (Vipera berus) in threat posture. Dorset, UK June.

Pete Oxford / Snake charmer's African puff-adder (Bitis arietans arietans) Djemaa el-Fna (the square), Marrakech, Morocco, June 2009

Tony Phelps / Puff Adder (Bitis arietans) adult male. deHoop NR, Western Cape, South Africa

Ernie Janes / Adder (Vipera berus) on heathland path close to man walking his Springer spaniel dog, UK, August

Tony Phelps / Puff Adder (Bitis arietans) juvenile male close up, deHoop NR, Western Cape, South Africa

Tony Phelps / Puff Adder (Bitis arietans) juvenile male, coiled in sand, deHoop NR, Western Cape, South Africa

Colin Varndell / Adder (Viper berus) head portrait of male at rest, Dorset, UK, June

Laurent Geslin / Horned adder (Bitis caudalis) coiled up, Namib Desert, Namibia

Tony Phelps / Puff Adder (Bitis arietans) immature male basking under vegetation 'mosaic basking'. Redstone Hills, Calidzdorp, Little Karoo, South Africa, July

Tony Phelps / Puff Adder (Bitis arietans) juvenile female basking on side of road. DeHoop NR, Western Cape, South Africa

Andy Sands / Two male Adders (Vipera berus) fighting / dancing during mating season, Captive, UK

Andy Sands / Two male Adders (Vipera berus) fighting / dancing during mating season, Captive, UK

Andy Sands / Two male Adders (Vipera berus) fighting / dancing during the mating season, Captive, UK

Daniel Heuclin / Common / Cross adder (Vipera berus) head portrait of female from above. Finland, Scandinavia. Controlled conditions.

Daniel Heuclin / Common / Cross adder (Vipera berus) female in woodlands. Finland, Scandinavia. Controlled conditions.

Daniel Heuclin / Common / Cross adder (Vipera berus) male and female together, coiled on moss. Finland, Scandinavia. Controlled conditions.

Daniel Heuclin / Common / Cross adder (Vipera berus) female emerging from ground cover, with tongue exposed. Finland, Scandinavia. Controlled conditions.

Daniel Heuclin / Common / Cross adder (Vipera berus) male basking between patches of hoar frost. Finland, Scandinavia. Controlled conditions.

Colin Varndell / Adult female Adder (Vipera berus) basking, Dorset, UK, April

Colin Varndell / Adult female Adder (Vipera berus) Dorset, UK, April

Colin Varndell / Adult male Adder (Vipera berus) basking, Dorset, UK, April

Michael D. Kern / Horned adder (Bitis caudalis) captive, from SW Africa