Miles Barton / Panamanian Golden Frog (Atelopus ziteki) Panama, Featured in BBC NHU series 'Life in Cold Blood'. Species now extinct in the wild

Miles Barton / Panamanian golden frog (Atelopus ziteki) reacting to the image of a frog on a video monitor. Experiment carried out to reveal the purpose of the frog's waving behaviour - to attract mates and deter ri...

Miles Barton / Sir David Attenborough with Argus monitor (Varanus panoptes rubidus) standing on its hind legs when approached, Western Australia. November 2006, on location filming for BBC NHU series 'Life in Cold B...

Miles Barton / Sir David Attenborough observing Galapagos Giant tortoises (Geochelone nigra) mating in the shade of a tree, midday, Alcedo Crater, Isabela Is, Galapagos, May 2006, on location for filming for BBC NHU...

Miles Barton / Sir David Attenborough observing a male Oustalet's chameleon (Furcifer oustaleti) the largest chameleon in the world, Montagne D'Ambre, Madagascar, on location for filming of BBC NHU series 'Life in C...

Miles Barton / Filming Panamanian Golden Frog (Atelopus ziteki)reacting to the model of a waving frog. Experiment carried out to reveal the purpose of the frog's waving behaviour ?to attract mates and deter rivals....

Miles Barton / Panamanian Golden Frog (Atelopus ziteki) reacting to the model of a waving frog. Experiment carried out to reveal the purpose of the frog's waving behaviour ?to attract mates and deter rivals. Feature...

James Brickell / Yellow anaconda (Eunectes notaeus ) in the Iberia Marshes of Northern Argentina.

James Brickell / Sir David Attenborough holding a Gidgee skink (Egernia stokesi) in Adelaide, South Australia whilst filming for BBC television series Life in Cold Blood. November 2006

James Brickell / Sir David Attenborough watching a Gidgee skink, (Egernia stokesi) performing a threat display in Adelaide, South Australia, whilst filming for BBC television series Life in Cold Blood. November 2006

James Brickell / Sir David Attenborough watching a Side blotched lizard (Uta stansburiana) on rock, Santa Nella, California, USA. For BBC television series "Life in Cold Blood", April 2006

James Brickell / Sir David Attenborough watching a Side blotched lizard (Uta stansburiana) on rock, Santa Nella, California, USA. For BBC television series "Life in Cold Blood", April 2006

James Brickell / Sir David Attenborough approaching a Mozambique Spitting Cobra (Naja mossambica) prior to having venom spat at his face, whilst filming for BBC television series Life in Cold Blood. Houdspruit, South...

James Brickell / Blind Tiger Snake (Notechis scutatus) and Silver Gull (Chroicocephalus novaehollandiae) on Carnac Island, Perth, Western Australia. A proportion of the tiger snakes on the island (including this one)...

James Brickell / Black Mamba (Dendroaspis polylepis ) swimming in the Oliphants River, Houdspruit, South Africa

James Brickell / Waxy Monkey tree frog (Phyllomedusa sauvagii) studio shot . Captive

Miles Barton / David Attenborough observing an Argus monitor lizard (Varanus panoptes rubidus) Western Australia, November 2006, on location for BBC NHU series 'Life in Cold Blood' This species of monitor rears up...

Miles Barton / David Attenborough observing an Argus monitor lizard (Varanus panoptes rubidus) Western Australia, November 2006, on location for BBC NHU series 'Life in Cold Blood' This species of monitor rears up...

Miles Barton / David Attenborough observing a Oustalet's chameleon (Furcifer oustaleti), Northern Madagascar, January 2007, on location for BBC NHU series 'Life in Cold Blood'

Miles Barton / Shingleback / Sleepy lizard (Trachydosaurus / Tiliqua rugosus) baby on hand. Captive, South Australia

Miles Barton / Shingleback / Sleepy lizard (Trachydosaurus / Tiliqua rugosus) adult gape display to deter predator, Burra, South Australia

Miles Barton / Shingleback / Sleepy lizard (Trachydosaurus / Tiliqua rugosus) pair, Burra, South Australia

Miles Barton / Shingleback / Sleepy lizard (Trachydosaurus / Tiliqua rugosus) pair, Burra, South Australia

Miles Barton / Sleepy lizard (Trachydosaurus / Tiliqua rugosus) pair, Burra, South Australia

Miles Barton / Shingleback / Sleepy lizard (Trachydosaurus / Tiliqua rugosus) asleep on rock, Hawker, Flinders Ranges, South Australia

Miles Barton / Shingleback / Sleepy lizard (Trachydosaurus / Tiliqua rugosus) asleep on rock, Hawker, Flinders Ranges, South Australia

Miles Barton / Life in Cold Blood BBC television series crew filming Sir David Attenborough with side blotched lizard (Uta stansburiana) Santa Nella, California, USA, April 2006

Miles Barton / Sir David Attenborough with side blotched lizard (Uta stansburiana) on rock, Santa Nella, California, USA. For BBC television series "Life in Cold Blood", April 2006

Miles Barton / Pygmy blue tongued skink (Tiliqua adelaidensis) feeding on mealworm on fishing line, a technique uded by scientists and conservationists to catch them. Burra, South Australia

Miles Barton / Pygmy blue tongued skink (Tiliqua adelaidensis) feeding on mealworm on fishing line, a technique used by scientists and conservationists to catch them, and being filmed with straightscope lens. Burra,...

Miles Barton / Inland Bearded Dragon (Pogona vitticeps) adult on barbed wire fence at farm in Hawker, Flinders Ranges, South Australia

Miles Barton / Lake Eyre Dragon (Ctenophorus maculosus) Alice Springs National Park, Northern Territory, Australia. Captive.

Miles Barton / Mexican / Guatemalan beaded lizards (Heloderma horridum charlesbogerti) males wrestling. Captive Venomous species

Miles Barton / Mexican / Guatemalan beaded lizards (Heloderma horridum charlesbogerti) males wrestling. Captive Venomous species

Miles Barton / Armadillo girdled lizard (Cordylus cataphractus) coiled up in defensive posture in person's hand. Elands Bay, South Africa

Miles Barton / Pygmy blue-tongued skink (Tiliqua adelaidensis) on sand, Australia. It was thought for a time to be extinct, and is still threatened

Miles Barton / Panther chameleon (Furcifer / Chamaeleo pardalis) displaying, Montagne D'Ambre, Madagascar

Miles Barton / Short horned / Elephant eared chameleon (Calumma brevicornis) on branch, Montagne D'Ambre, Madagascar

Miles Barton / Oustalet's Chameleon (Furcifer oustaleti), Montagne D'Ambre, Madagascar

Miles Barton / Snub nosed / Labord's Chameleon (Furcifer / Chamaelso labordi) on branch, Kirindy Dry Forest, Madagascar

Miles Barton / Madagascan day gecko (Phelsuma madagascariensis) on tree trunk lapping honey dew from a sap sucking planthopper insect (invisible). Kirindy Dry Forest, Madagascar.

Miles Barton / Stumptail chameleon (Brookesia brygoii) on finger, Madagascar

Miles Barton / Sir David Attenborough sitting with group of Giant Tortoises (Geochelone elephantopus) Galapagos. Filmed for BBC television series "Life in Cold Blood", May 2006

Miles Barton / Perentie lizard (Varanus giganteus) scenting with forked tongue, Alice Springs, Australia. Semi-captive.

Miles Barton / Western blue-tongued skink (Tiliqua occipitalis) Alice Springs National Park, Northern Territory, Australia. Captive.

Miles Barton / Lake Eyre Dragon (Ctenophorus maculosus) female rejecting male's advances by flipping herself onto her back to display orange underside. Alice Springs National Park, Northern Territory, Australia. Cap...

Miles Barton / Lake Eyre Dragon (Ctenophorus maculosus) female rejecting male's advances by flipping herself onto her back to display orange underside. Captive. Alice Springs National Park, Northern Territory, Austr...

Miles Barton / Reticulated python (Python reticulata) feeding on a Muntjac deer, Bristol studio, UK