Nick Garbutt / Komodo dragon (Varanus komodoensis) male running. Rinca Island, Komodo National Park, Indonesia. Endangered.

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.

Mark MacEwen / Komodo dragon (Varanus komodoensis) with tongue on out beach, Komodo National Park, the islands of Komodo, Indonesia. Vulnerable species.

Mark MacEwen / Komodo dragon (Varanus komodoensis) walking with tongue extended on beach, found in the islands of Komodo, Indonesia. Vulnerable species.

Mark MacEwen / Komodo dragon (Varanus komodoensis) with tongue extended on beach, Komodo National Park, Indonesia. Vulnerable species.

Cyril Ruoso / Komodo dragon (Varanus komodoensis) scavenging on another Komodo dragon, Rinca Island, Komodo National Park, Indonesia. Non-ex

Cyril Ruoso / Komodo dragon (Varanus komodoensis) in habitat with boat, Rinca Island, Komodo National Park, Indonesia. Non-ex

Cyril Ruoso / View of Komdodo dragon (Varanus komodoensis) from nest, Rinca Island, Komodo National Park, Indonesia. Non-ex

Cyril Ruoso / Komodo dragons (Varanus komodoensis) scavenging Water buffalo carcass. Rinca Island, Komodo National Park, 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

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.

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

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

Jurgen Freund / Boyd’s Forest Dragon climbing tree {Hypsilurus boydii} Mossman Gorge, Queensland, Australia

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Stephen Belcher / Komodo Dragon (Varanus komodoensis) with tongue extended, Komodo Island, Komodo National Park, Indonesia

Stephen Belcher / Komodo Dragon (Varanus komodoensis) standing on hind legs with mouth open in defensive display, Rinca Island, Komodo National Park, Indonesia

Stephen Belcher / Komodo Dragon (Varanus komodoensis) standing in the sea with tongue extended, Komodo Island, Komodo National Park, Indonesia

Robert Valentic / Gippsland water dragon (Intellegama lesuerii howittii) male from riparian temperate rainforest near Berri, New South Wales, Australia.

Robert Valentic / Gippsland water dragon (Intellegama lesuerii howittii) male, from riparian temperate rainforest near Berri, NSW, Australia.

Jurgen Freund / Boyd's forest dragon (Lophosaurus boydii) on tree trunk. Wet Tropics of Queensland, Australia.

Jurgen Freund / Boyd's forest dragon (Lophosaurus boydii) on tree trunk in rainforest. Wet Tropics of Queensland, Australia.

Jurgen Freund / Boyd's forest dragon (Hypsilurus boydii) on tree trunk in rainforest. Queensland, Australia.

Jeff Vanuga / Agama lizard (Agama agama) sunning on a rock in the Serengeti Plains, Tanzania.

Robin Chittenden / Green forest lizard (Calotes calotes) on tree trunk, Sri Lanka.

Robin Chittenden / Green forest lizard (Calotes calotes) portrait, Sri Lanka.

Robin Chittenden / Green forest lizard (Calotes calotes) Sri Lanka.

Bert Willaert / Western netted dragon (Ctenophorus reticulatus) basking on rock. Tamala Station, Shark Bay, Western Australia. October.