Suzi Eszterhas / Ring tailed lemurs (Lemur catta) feeding on Spiny forest tree (Didierea trollii).Berenty Private Reserve, Madagascar

Robert Valentic / Cunningham's skink (Egernia cunninghami) basking at midday, Merri Creek on the northern fringe of metropolitan Melbourne, Victoria, Australia. October. Controlled conditions.

Robert Valentic / Eastern Spiny-tailed Gecko (Strophurus williamsi) male, near St George, Queensland, Australia.

Robert Valentic / Northern spiny-tailed gecko (Strophurus ciliaris aberrans) female, Yardie Creek, Exmouth Peninsula, Western Australia.

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

Robert Valentic / Cunningham's Skink (Egernia cunninghami) juvenile basking adjacent to a rock crevice, Merri Creek, Victoria, Australia. January.

Sean Crane / Black Spiny-tailed Iguana (Ctenosaura similis), Ambergris Caye, Belize

Alain Dragesco-Joffe / Spiny tailed agama (Uromastix acanthinurus) adult, Tunisia, Sahara.

Brian Bevan / Male Ornate mastigurex (Uromastyx ornatus) basking on a rock, UK. Captive, native to the Middle East.

Angelo Gandolfi / Black iguana (Ctenosaura similis) on branch, Corcovado National Park, Osa, Costa Rica, March.

Angelo Gandolfi / Black iguana (Ctenosaura similis) in breeding colours, Nicoya peninsula, Costa Rica,

Jiri Lochman / Cunningham's Skink (Egernia cunninghami), Kanangra-Boyd National Park, Greater Blue Mountains UNESCO Natural World Heritage Site, New South Wales.

Jiri Lochman / Cunningham's Skink (Egernia cunninghami), Kanangra-Boyd National Park, Greater Blue Mountains UNESCO Natural World Heritage Site, New South Wales.

Jiri Lochman / Cunningham's Skink (Egernia cunninghami), Kanangra-Boyd National Park, Greater Blue Mountains UNESCO Natural World Heritage Site, New South Wales.

Jiri Lochman / Cunningham's Skink (Egernia cunninghami), Kanangra-Boyd National Park, Greater Blue Mountains UNESCO Natural World Heritage Site, New South Wales.

David Pattyn / Ring tailed lemur (Lemur catta) sitting on branch amongst spiny plants, Berenty Private Reserve, southern Madagascar.

David Pattyn / Ring tailed lemur (Lemur catta) sitting amongst spiny plants, Berenty Private Reserve, southern Madagascar.

David Pattyn / Ring tailed lemur (Lemur catta) sitting on spiny plant, Berenty Private Reserve, southern Madagascar.

Jen Guyton / Black iguana (Ctenosaurus similis) in rainforest, whilst juveniles are arboreal adults of this species are ground dwelling. Costa Rica

Jen Guyton / Black iguana (Ctenosaurus similis) in rainforest, whilst juveniles are arboreal adults of this species are ground dwelling. Costa Rica

Jen Guyton / Black iguana (Ctenosaurus similis) juvenile. Juveniles of this species black iguanas are arboreal and very cryptic in order to avoid predators. Costa Rica

Robert Valentic / Western spiny tailed gecko (Strophurus strophurus) perched motionless on an Acacia branch overlooking Shark Bay, Western Australia.

Robert Valentic / South-west spiny-tailed gecko (Strophurus spinigerus) male on twig at dusk, Kalbarri, Western Australia.

Robert Valentic / Northern spiny-tailed gecko (Strophurus ciliaris aberrans) camouflaged on dead twig, Exmouth, Western Australia.

Claudio Contreras / Common spiny-tailed iguana (Ctenosaura similis) climbing Green iguana (Iguana iguana), Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Claudio Contreras / Common spiny-tailed iguana (Ctenosaura similis) in front of Green iguana (Iguana iguana), Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Chris Mattison / Northern spiny-tailed gecko (Strophurus ciliaris) tail, showing spines. Captive, occurs in Australia.

Chris Mattison / Northern spiny-tailed gecko (Strophurus ciliaris) licking eyeball, Captive, occurs in Australia.

Chris Mattison / Northern spiny-tailed gecko (Strophurus ciliaris) portrait, captive,

Chris Mattison / Northern spiny-tailed gecko (Strophurus ciliaris) view from above, captive occurs in Australia.

Huw Cordey / Black iguana (Ctenosaura similis) predating hatchling olive ridley turtle (Lepidochelys olivacea), Nancite, Santa Rosa National Park, Costa Rica.

Daniel Heuclin / Spiny-tailed monitor (Varanus acanthurus) captive, endemic to North Australia.

Suzi Eszterhas / Ring tailed lemur (Lemur catta) mother carrying two-week baby, feeding on spiny forest tree (Alluaudia procera) Berenty Private Reserve, Madagascar.

Suzi Eszterhas / Ring tailed lemur (Lemur catta) feeding on spiny forest tree (Alluaudia procera) Berenty Private Reserve, Madagascar

Suzi Eszterhas / Ring tailed lemur (Lemur catta) mother with two-week-old baby on back feeding on spiny forest tree (Alluaudia procera) Berenty Private Reserve, Madagascar

Suzi Eszterhas / Ring tailed lemur (Lemur catta) feeding on spiny forest tree (Alluaudia procera).Berenty Private Reserve, Madagascar

Pete Oxford / Black Spiny-tailed Iguana (Ctenosaura similis) sunning on rock, Banco Chinchorro, Yucatan Peninsula, Mexico

Cyril Ruoso / Ringed-tailed lemur (Lemur catta) in spiny tree, Berenty reserve, Madagascar

Bernard Castelein / Collared iguanid (Oplurus cuvieri) close up of foot, Kirindy Forest, Madagascar.

Bernard Castelein / Collared iguanid (Oplurus cuvieri), Kirindy Forest, Madagascar.

Hanne & Jens Eriksen / Spiny tailed lizard (Uromastyx aegyptia microlepis) Oman, January

Hanne & Jens Eriksen / Spiny tailed lizard (Uromastyx aegyptia microlepis) Oman, January

Chris Mattison / Saharan or Geyr's dab lizard (Uromastyx geyri) on white background, captive from Algeria, Mali and Niger.

Chris Mattison / Saharan or Geyr's dab lizard (Uromastyx geyri) on white background, captive from Algeria, Mali and Niger.

Chris Mattison / Saharan or Geyr's dab lizard (Uromastyx geyri) on white background, captive from Algeria, Mali and Niger.

John Cancalosi / Male Spiny-tailed iguana / Black iguana / Black ctenosaur (Ctenosaura similis) displaying by bobbing head, Costa Rica.

Daniel Heuclin / Spiny-tailed lizard (Uromastyx nigriventris) near Ouarzazate, Morroco.

Daniel Heuclin / Spiny-tailed lizard (Uromastyx nigriventris) eating, near Ouarzazate, Morocco.

Daniel Heuclin / Spiny-tailed lizard (Uromastyx nigriventris) on rocks, near Ouarzazate, Morocco.

Daniel Heuclin / Spiny-tailed lizard (Uromastyx nigriventris) on rocks, near Ouarzazate, Morocco.

Daniel Heuclin / Spiny-tailed lizard (Uromastyx nigriventris) in habitat, near Ouarzazate, Morocco.

Daniel Heuclin / Spiny-tailed lizard (Uromastyx nigriventris) in habitat, near Ouarzazate, Morocco.

Daniel Heuclin / Spiny-tailed lizard (Uromastyx nigriventris) portraits, near Ouarzazate, Morocco.

Daniel Heuclin / Spiny-tailed lizard (Uromastyx nigriventris) in habitat, near Ouarzazate, Morocco.

Daniel Heuclin / Spiny-tailed lizard (Uromastyx nigriventris) on rocks, near Ouarzazate, Morocco.

Daniel Heuclin / Spiny-tailed lizard (Uromastyx nigriventris) on rocks, near Ouarzazate, Morocco.

Daniel Heuclin / Spiny-tailed lizard (Uromastyx nigriventris) in habitat, near Ouarzazate, Morocco.

Daniel Heuclin / Spiny-tailed lizard (Uromastyx nigriventris) on rocks, near Ouarzazate, Morocco.

Daniel Heuclin / Local Berber man eating Spiny-tailed lizard (Uromastyx nigriventris) cooked on fire, near Ouarzazate, Morocco, October 2013.

Daniel Heuclin / Local Berber man preparing Spiny-tailed lizard (Uromastyx nigriventris) to cook on fire, near Ouarzazate, Morocco, October 2013.

Daniel Heuclin / Local Berber man preparing Spiny-tailed lizard (Uromastyx nigriventris) to cook on fire, near Ouarzazate, Morocco, October 2013.

Daniel Heuclin / Local Berber man preparing Spiny-tailed lizard (Uromastyx nigriventris) to cook on fire, near Ouarzazate, Morocco, October 2013.

Daniel Heuclin / Local Berber man cooking Spiny-tailed lizard (Uromastyx nigriventris) on fire, near Ouarzazate, Morocco, October 2013.

Suzi Eszterhas / Ring-tailed Lemur (Lemur catta) leaping from Octopus Tree (Didierea trollii) to another, Berenty Private Reserve, Madag ascar

Donald M. Jones / Black Spiny-tailed Iguana (Ctenosaura similis) in tree, Yucatan Peninsula, Mexico

Donald M. Jones / Black Spiny-tailed Iguana (Ctenosaura similis), Yucatan Peninsula, Mexico

Donald M. Jones / Black Spiny-tailed Iguana (Ctenosaura similis) in defensive posture, Yucatan Peninsula, Mexico

Donald M. Jones / Black Spiny-tailed Iguana (Ctenosaura similis), Yucatan Peninsula, Mexico

Donald M. Jones / Black Spiny-tailed Iguana (Ctenosaura similis) in tree, Yucatan Peninsula, Mexico

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) trio feeding on fresh leaves of the Madagascan Ocotillo (Alluaudia procera) vulnerable, Berenty Private Reserve, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) close up of tail climbing on a spiny tree, vulnerable, Berenty Private Reserve, Madagascar

Daniel Heuclin / Armadillo Lizard (Cordylus cataphractus) captive from South Africa

Daniel Heuclin / Mauritanian spiny-tailed Lizard (Uromastyx dispar flavifasciata) Mauritania

Daniel Heuclin / Morrocan Spiny-tailed Lizard (Uromastyx acanthinura) near Ouarzazate, Morocco

Daniel Heuclin / Mauritanian spiny-tailed Lizard (Uromastyx dispar flavifasciata) Mauritania

Chris Mattison / Eastern spiny-tailed gecko (Strophurus williamsi). Captive, endemic to Australia.

Chris Mattison / Soft spiny-tailed gecko (Strophurus spinigerus) resting in its typical head-down position. Captive. Endemic to Western Australia.

Chris Mattison / Kristen's spiny-tailed gecko (Strophurus krisalys). Captive. Endemic to Australia.

Chris Mattison / Eastern spiny-tailed gecko (Strophurus williamsi). Captive. Endemic to Australia.

Chris Mattison / Kristen's spiny-tailed gecko (Strophurus krisalys). Captive. Endemic to Australia.

Chris Mattison / Soft spiny-tailed gecko (Strophurus spinigerus) resting in its typical head-down position. Captive. Captive. Endemic to Western Australia.

Chris Mattison / Golden-tailed gecko (Strophurus taenicauda). Captive. Western Australia.

Chris Mattison / Golden-tailed gecko (Strophurus taenicauda). Captive. Western Australia.

Chris Mattison / Golden-tailed gecko (Strophurus taenicauda) head close up showing unusual skin pattern. Captive. Western Australia.

Chris Mattison / Golden-tailed gecko (Strophurus taenicauda). Endemic to Western Australia.

Chris Mattison / Golden-tailed gecko (Strophurus taenicauda). Endemic to Western Australia.

Chris Mattison / Soft spiny-tailed Gecko (Strophurus spinigerus) in profile. Endemic to Western / Northern Australia.

Chris Mattison / Soft spiny-tailed gecko (Strophurus spinigerus). Endemic to Western and Northern Australia.

Chris Mattison / Soft spiny-tailed gecko (Strophurus spinigerus). Endemic to Western / Northern Australia.

Claudio Contreras / Common Spiny-Tailed Iguana (Ctenosaura similis) at ancient Maya temple, Uxmal, Yucatan Peninsula, Mexico, October.

Claudio Contreras / Common Spiny-Tailed Iguana (Ctenosaura similis), Uxmal, Yucatan Peninsula, Mexico, October.

Claudio Contreras / Common Spiny-Tailed Iguana (Ctenosaura similis), Uxmal, Yucatan Peninsula, Mexico, October.

Loic Poidevin / Madagascar spiny tailed lizard (oplurus cuvieri) Madagascar

John Cancalosi / Black tailed spiny iguana ( Ctenosaura similis) swallowing crab, Murcielago Island, Santa Rosa National Park, Costa Rica. Sequence 6 of 6

John Cancalosi / Black tailed spiny iguana ( Ctenosaura similis) swallowing crab, Murcielago Island, Santa Rosa National Park, Costa Rica. Sequence 5 of 6

John Cancalosi / Black tailed spiny iguana ( Ctenosaura similis) swallowing crab, Murcielago Island, Santa Rosa National Park, Costa Rica. Sequence 4 of 6