Robert Valentic / Central bearded dragon (Pogona vitticeps) basking in mallee / heathland habitat on the Murrayville Track in the Big Desert Wilderness of north-western Victoria, Australia.

Robert Valentic / Phuket horned tree lizard (Acanthosaura phuketensis) near Bang Pae Waterfall, Khao Phra Thaew NP, Phuket Island, Thailand.

Suzi Eszterhas / Komodo Dragon (Varanus komodoensis) pair flicking tongues, Komodo National Park, Indonesia

David Fleetham / Komodo dragon (Varanus komodoensis), the world's largest lizard. Rinca Island, Komodo National Park, Indonesia.

David Fleetham / Komodo dragon (Varanus komodoensis), with sailing-boat in background. Rinca Island, Komodo National Park, Indonesia.

Cyril Ruoso / Komodo Dragon (Varanus komodoensis) drooling, the lizard's saliva is high in bacteria and bites quickly become infected, Rinca Island, Komodo National Park, Indonesia

Cyril Ruoso / Komodo Dragon (Varanus komodoensis) approaching, Komodo National Park, Indonesia

Cyril Ruoso / Komodo Dragon (Varanus komodoensis) using tongue to smell, Komodo National Park, Indonesia

Chien Lee / Komodo Dragon (Varanus komodoensis) in grass, Nusa Tenggara, Indonesia

Andy Rouse / Marine Iguana (Amblyrhynchus cristatus) walking along beach. Cerro Dragon, Galapagos, September.

Georgette Douwma / Komodo dragons (Varanus komodoensis) on beach, Rinca, Komodo National Park, Indonesia, October

Stephen Dalton / Giant sailfin dragon lizard (Hydrosaurus pustulatus) running over water, from Indonesia, controlled conditions

Stephen Dalton / Flying lizard (Draco volans) gliding, controlled conditions, from Indonesia

Stephen Dalton / Flying lizard (Draco volans) gliding, controlled conditions, from Indonesia

Stephen Dalton / Giant sailfin dragon lizard {Hydrosaurus amboinensis} running over the surface of water, controlled conditions, from Indonesia

Juan Carlos Munoz / Comb crested dragon lizard {Gonocephalus liogaster} on Strangler fig roots, Danum valley forest reserve, Sabah, Borneo, Malaysia

Nick Garbutt / Bornean angle-headed lizard (Gonocephalus bornensis) with mouth open in forest habitat, Danum Valley, Sabah, Borneo, Malaysia

Juergen Freund / Boyds Forest Dragon climbing tree {Hypsilurus boydii} Mossman Gorge, Queensland, Australia

Michael & Patricia Fogden / Frilled Lizard (Chlamydosaurus kingii) with frill raised and mouth open in defensive posture on tree log, Australia

Michael & Patricia Fogden / Boyd's Forest Dragon (Hypsilurus boydii) portrait, Queensland, Australia

Tui De Roy / Komodo Dragon (Varanus komodoensis) large male walking towards camera, Komodo National Park, Komodo Island, Indonesia

Mark Jones / Komodo Dragon (Varanus komodoensis) large male testing ground for scent with specialized forked tongue, Komodo National Park, Komodo Island, Indonesia

Michael Pitts / Komodo dragon hatching from egg (Varanus komodoensis) Komodo Is Indonesia

Michael Pitts / Komodo dragon, 2-day-old (Varanus komodoensis) in Tamarind tree, Komodo Is

Michael Pitts / Komodo dragon about to lay eggs in burrow made in megapode mound (Varanus komodoensis) Komodo Is

Michael Pitts / Komodo dragons, 2-day-old (V. komodoensis) Hatchlings climb trees to avoid being eaten by predators.

Michael Pitts / Komodo dragon hatchling emerging from megapode mound (Varanus komodoensis) Komodo Is

Michael Pitts / Komodo dragon female head profile portrait (Varanus komodoensis) Komodo Is Indonesia

Michael Pitts / Komodo dragon hatchling, 4 days old. Komodo Island, Indonesia. The young climb trees to escape being eaten by adult dragons.

BARBARA TODD / Komodo dragon, Indonesia.

Michael Pitts / Komodo dragon {Varanus komodoensis} hatching from egg, Komodo Island, Indonesia.

Jurgen Freund / Komodo Dragon on beach with tourists, Komodo Island

Michael Pitts / Komodo dragon on beach, Komodo Is (Varanus komodoensis) Indonesia

PREMAPHOTOS / Male Flying lizard displaying (Draco volans) Sulawesi, Indonesia

Robert Valentic / Gippsland Water Dragon (Intellegama lesuerii howittii) male, upper Pambula River, New South Wales, Australia. Controlled conditions

Steven David Miller / Eastern water dragon (Intellagama lesueurii lesueurii) male basking. Lane Cove National Park, New South Wales, Australia.

Fabio Pupin / Kenyan rock agama, (Agama lionotus), male, Ruaha NP, Tanzania, . Non-ex.

Fabio Pupin / Kenyan rock agama, (Agama lionotus), female, Ruaha NP, Tanzania, . Non-ex.

Fabio Pupin / Southern rock agama, (Agama atra), South Africa, February . Non-ex.

Steven David Miller / Frilled-neck lizard (Chlamydosaurus kingii) camouflaged against tree stump. Mary River National Park, Northern Territory, Australia.

Steven David Miller / Frilled-neck lizard (Chlamydosaurus kingii) lying still, camouflaged against branch to avoid predators, Mary River National Park, Northern Territory, Australia.

Steven David Miller / Frilled-neck lizard (Chlamydosaurus kingii) lying still against branch to avoid predators, camouflaged against tree stump. Mary River National Park, Northern Territory, Australia.

Cyril Ruoso / Variegated toadhead agama (Phrynocephalus versicolor) basking. Great Gobi B Strictly Protected Area, Mongolia. August.

Duncan Murrell / Green garden lizard (Calotes calotes) juvenile, Laxapana Falls, Maskeliya, Sri Lanka.

Duncan Murrell / Hump-nosed / Lyreshead lizard (Lyriocephalus scutatus),Sinharaja Forest Reserve, Unesco Biosphere Reserve and World Heritage Site, Sri Lanka. Endemic.

Duncan Murrell / Man with Hump-nosed / lyreshead lizard (Lyriocephalus scutatus),Sinharaja Forest Reserve, Unesco Biosphere Reserve and World Heritage Site, Sri Lanka. Endemic.

Duncan Murrell / Hump-nosed or lyreshead lizard (Lyriocephalus scutatus),Sinharaja Forest Reserve, Unesco Biosphere Reserve and World Heritage Site, Sri Lanka. Endemic.

Duncan Murrell / Green garden lizard (calotes calotes) showing color variation, Deniyaya, Sri Lanka.

Duncan Murrell / Brown-patched kangaroo lizard / Wiegmann's agama (Otocryptis wiegmanni), Laxapana Waterfall, Maskeliya, Sri Lanka.

Robert Valentic / Boyd's forest dragon (Lophosaurus boydii) male, Mossman Gorge in NE Queensland, Australia. Summer.

Robert Valentic / Emma gray's forest dragon (Calotes emma emma) female from the botanical garden trail in karst rainforest habitat within the Phong Nha Ke Bang National Park in central Vietnam. Dry season.

Robert Valentic / Chinese water dragon (Physignathus cocincinus) male from a small stream flowing through karst rainforest within the Phong Nha-Ke Bang National Park, central Vietnam. Dry season.

Robert Valentic / Brown pricklenape (Acanthosaura lepidogaster) female, Phong Nha-Ke Bang National Park in central Vietnam. Dry season.

Robert Valentic / Brown pricklenape lizard (Acanthosaura lepidogaster) female in karst rainforest within the Phong Nha-Ke Bang National Park in central Vietnam. Dry season.

Edwin Giesbers / Starred agama (Stellagama stellio cypriaca) on tree trunk. Cyprus. April.

Edwin Giesbers / Starred agama (Stellagama stellio cypriaca) basking on rock. Cyprus. April.

Edwin Giesbers / Starred agama (Stellagama stellio cypriaca) basking on rock. Cyprus. April.

Edwin Giesbers / Starred agama (Stellagama stellio cypriaca) basking on rock. Cyprus. April.

Edwin Giesbers / Starred agama (Stellagama stellio cypriaca) basking on rock. Cyprus. April.

Enrique Lopez-Tapia / Spiny-tailed lizard (Uromastyx hardwickii) near its excavated burrow, Rajasthan, India.

Doug Gimesy / Portrait of a rescued Eastern Water Dragon, (Intellagama lesueurii lesueuri), rescued from wildlife smuggling, Captive.

Doug Gimesy / Portrait of a rescued Eastern Water Dragon, (Intellagama lesueurii lesueuri). Captive, rescued from wildlife smuggling.

Doug Gimesy / Portrait of a rescued Eastern Water Dragon, 1+Intellagama lesueurii lesueuri+2. Captive, rescued from wildlife smuggling.

Doug Gimesy / Portrait of a rescued Eastern Water Dragon, (Intellagama lesueurii lesueuri). Captive, rescued from wildlife smuggling.

Steven David Miller / Eastern / Australian Water Dragon (Intellagama lesueurii) male basking on rocks, Ballina, Queensland, Australia.

Steven David Miller / Central bearded dragon (Pogona vitticeps) warming up on a rock, Alice Springs Reptile Centre, Northern Territory, Australia. Captive.

Steven David Miller / A close up of a Thorny devil (Moloch horridus), Alice Springs Reptile Park, Northern Territory, Australia.

Robert Valentic / Peninsula horned tree lizard (Acanthosaura armata) female, Cross-island trail, Tioman Island, Malaysia.

Robert Valentic / Earless agamid (Aphaniotis fusca) primary lowland rainforest, Tioman Island, Malaysia.

Robin Chittenden / Black-lipped lizard (Calotes nigrilabris) on fern plant, Sri Lanka.

Robin Chittenden / Rhino-horned lizard (Ceratophora stoddartii) Sri Lanka.

Duncan Murrell / Leaf-nosed Agama (Aphaniotis ornata) Danum Valley Conservation Area, Sabah, Malaysian Borneo.

David Perpinan / Cachectic or emaciated captive Bearded dragon (Pogona vitticeps) confiscated by police due to poor care'United Kingdom. Small repro only

David Perpinan / Radiography of a captive Bearded dragon (Pogona vitticeps) with sand impaction, a common condition in captive reptiles. small repro only

David Perpinan / Captive bearded dragon (Pogona vitticeps) suffering from mite infestation. Small repro only

David Perpinan / Stomatitis in a captive Chinese water dragon (Physignathus cocincinus). This is a common condition in captive water dragons, as they are nervous and hit themselves against glass.

Steven David Miller / Central netted ground dragon (Ctenophorus nuchalis) basking in evening light. Kings Canyon, Watarrka National Park, Northern Territory, Australia.

Suzi Eszterhas / Komodo Dragon (Varanus komodoensis), Komodo National Park, Indonesia

Suzi Eszterhas / Komodo Dragon (Varanus komodoensis), Komodo National Park, Indonesia

Daniel Heuclin / Australian water dragon (Intellagama lesueurii) hatching from egg, captive, occurs in East Australia.

Daniel Heuclin / Australian water dragon (Intellagama lesueurii) hatching from egg, captive, occurs in East Australia.

Yashpal Rathore / Superb fan-throated lizard (Sarada superba) male displaying dewlap, Chalkewadi Plateau, Maharashtra, India,. Sequence 2/2

Yashpal Rathore / Superb Fan-throated Lizard (Sarada superba), male walking on its hind legs displaying dewlap. Chalkewadi Plateau, Maharashtra, India. Sequence 1/2

Yashpal Rathore / Superb fan-throated lizard (Sarada superba) female, Chalkewadi Plateau, Maharashtra, India

Yashpal Rathore / Superb fan-throated lizard (Sarada superba) male displaying dewlap, Chalkewadi Plateau, Maharashtra, India

Yashpal Rathore / Superb fan-throated lizard (Sarada superba) male displaying dewlap, Chalkewadi Plateau, Maharashtra, India

Yashpal Rathore / Superb fan-throated lizard (Sarada superba) male displaying dewlap, Chalkewadi Plateau, Maharashtra, India

Yashpal Rathore / Superb fan-throated lizard (Sarada superba) male displaying dewlap, Chalkewadi Plateau, Maharashtra, India

Yashpal Rathore / Superb Fan-throated Lizard (Sarada superba) male shedding old skin. Chalkewadi Plateau, Maharashtra, India

Yashpal Rathore / Superb fan-throated lizard (Sarada superba) displaying dewlap, with wind turbines behind, Chalkewadi Plateau, Maharashtra, India

Yashpal Rathore / Superb fan-throated lizard (Sarada superba) displaying dewlap, Chalkewadi Plateau, Maharashtra, India

Yashpal Rathore / Superb fan-throated lizard (Sarada superba) ,male displaying dewlap. Chalkewadi Plateau, Maharashtra, India

Yashpal Rathore / Superb Fan-throated Lizard (Sarada superba) female shedding old skin. Chalkewadi Plateau, Maharashtra, India

Yashpal Rathore / Superb fan-throated Lizard (Sarada superba, ) with its dewlap displayed. Chalkewadi Plateau, Maharashtra, India

Yashpal Rathore / Superb fan-throated lizard (Sarada superba) two males competing - displaying dewlaps and crests, Chalkewadi Plateau, Maharashtra, India

Yashpal Rathore / Superb fan-throated lizard (Sarada superba) two males competing - displaying dewlaps and crests, Chalkewadi Plateau, Maharashtra, India