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

Tim Laman / Mangrove / Blue-tailed Monitor (Varanus doreanus)female. Paul Oliver weighs the monitor lizard. Foja Mountains, Papua, Indonesia, 2008. (taken during Conservation International Rapid Assessment Progra...

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

Rod Williams / Green / Emerald Tree Monitor (Varanus prasinus) head portrait climbing tree trunk. Captive, from Papua New Guinea, Indonesia

Georgette Douwma / Asian water monitor lizard (Varanus salvator) Malaysia. Sipidan.

Georgette Douwma / Asian water monitor lizard (Varanus salvator) climbing tree, Kinabatangan flood plain, Sabah, Malaysia