Bruno D'Amicis / Red-tailed Spiny-footed lizard (Acanthodactylus erythrurus) basking on sand, west coast of Northern Morocco, NW Africa

Hanne & Jens Eriksen / Spiny tailed lizard / Dhab {Uromastyx aegyptius microlepis} at burrow entrance, Sweihan, UAE

Hanne & Jens Eriksen / Spiny tailed lizard / Dhab {Uromastyx aegyptius microlepis} Sweihan, UAE

John Cancalosi / Clark's Spiny Lizard (Sceloporus clarkii) Sonoran Desert, Arizona, USA

John Cancalosi / Desert Spiny Lizard (Sceloporus magister) Sonoran Desert, Arizona, USA

Jouan & Rius / Spiny / Black iguana / Black ctenosaur (Ctenosaura similis) on beach, Pacific coast, Costa Rica

Jouan & Rius / Spiny or Warty Chameleon (Furcifer / Chamaeleo verrucosus) eating grasshopper, Southern Madagascar

Jouan & Rius / Warty / Spiny Chameleon (Furcifer / Chamaeleo verrucosus) eating grasshopper, South Madagascar

Rod Williams / Male Utila Spiny-tailed Iguana (Ctenosaura bakeri), Captive, found Utila Island (near Honduras), Critically Endangered Species

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

Petra Wegner / African Spiny-tailed Lizard (Uromastyx acanthinurus) lying on a hand, captive

Petra Wegner / African Spiny-tailed Lizard (Uromastyx acanthinurus), captive

Petra Wegner / African Spiny-tailed Lizard (Uromastyx acanthinurus), captive

Petra Wegner / Tail of an African Spiny-tailed Lizard (Uromastyx acanthinurus), captive

Juan Manuel Borrero / Moroccan spiny tailed lizard (Uromastyx acanthinurus nigriventris) on rocks in the High Atlas Mountains, Morocco December 2007

Juan Manuel Borrero / Moroccan spiny tailed lizard (Uromastyx acanthinurus nigriventris) on rocks in the High Atlas Mountains, Morocco December 2007

Juan Manuel Borrero / Boy with Moroccan spiny tailed lizards (Uromastyx acanthinurus nigriventris) in the High Atlas Mountains, Morocco December 2007

Juan Manuel Borrero / Moroccan spiny tailed lizard (Uromastyx acanthinurus nigriventris) on rocks in the High Atlas Mountains, Morocco December 2007

Juan Manuel Borrero / Boy holding a Moroccan spiny tailed lizard (Uromastyx acanthinurus nigriventris) in the High Atlas Mountains, Morocco December 2007

Rolf Nussbaumer / Texas Spiny Lizard {Sceloperus olivaceus} adult on Mesquite tree bark, Rio Grande Valley, Texas, USA, May

Doug Wechsler / Spiny tailed iguana {Ctenosaura similis} portrait. Santa Rosa NP, Costa Rica

Thomas Marent / Spiny-tailed Gecko (Diplodactylus ciliaris) camouflaged on tree, Kakadu National Park, Australia

Thomas Marent / Spiny-tailed Gecko (Diplodactylus ciliaris) camouflaged on tree, Kakadu National Park, Australia

Thomas Marent / Green Spiny Lizard (Sceloporus malachiticus) male, Costa Rica

Jose B. Ruiz / Spiny footed lizard (Acanthodactylus erythrurus) male, Spain. Endemic to dunes of Iberia.

Jose B. Ruiz / Spiny footed lizard (Acanthodactylus erythrurus) juvenile, Spain. Found in dunes, endemic to Iberia

Philippe Clement / Desert spiny lizard (Sceloporus magister) climbing Ocotillo (Fouquieria splendens). Saguaro National Park, Arizona, USA

Philippe Clement / Desert spiny lizard (Sceloporus magister) on rock showing camouflage colours. Saguaro National Park, Arizona, USA

Philippe Clement / Desert spiny lizard (Sceloporus magister) male showing throat in mating season colours. Saguaro National Park, Arizona, USA

Philippe Clement / Desert spiny lizard (Sceloporus magister) close-up on rock. Saguaro National Park, Arizona, USA

Philippe Clement / Desert spiny lizard (Sceloporus magister) climbing Ocotillo (Fouquieria splendens). Saguaro National Park, Arizona, USA

Philippe Clement / Sonoran Spiny-tailed Iguana (Ctenosaura hemilopha macrolopha) basking on Ocotillo (Fouquieria splendens) cactus. Arizona, USA. (Native to Mexico). Captive.

Philippe Clement / Sonoran Spiny-tailed Iguana (Ctenosaura hemilopha macrolopha) basking on rock. Arizona, USA. (Native to Mexico). Captive.

Philippe Clement / Sonoran Spiny-tailed Iguana (Ctenosaura hemilopha macrolopha) basking on rock, Arizona, USA. Captive.

Philippe Clement / Desert spiny lizard (Sceloporus magister) sunning on rock. Saguaro National Park, Arizona, USA

Rolf Nussbaumer / Spiny / Black Iguana {Ctenosaura similis} Manuel Antonio National Park, Costa Rica

Rolf Nussbaumer / Crevice Spiny Lizard {Sceloporus poinsetti} Hill Country, Texas, USA

Rolf Nussbaumer / Crevice Spiny Lizard {Sceloporus poinsetti} Hill Country, Texas, USA

PREMAPHOTOS / Egyptian spiny lizard {Uromastix aegypticus} basking next to its hole in desert, Israel

PREMAPHOTOS / Yarrow's / Mountain spiny lizard {Sceloporus jarrovi} Arizona, USA

PREMAPHOTOS / Spiny tailed iguana {Ctenosaura similis} juvenile camouflaged in forest, Mexico

PREMAPHOTOS / Malachite spiny lizard {Sceloporus malachiticus} in cloud forest, Costa Rica

PREMAPHOTOS / Spiny tailed iguana {Ctenosaura similis} juvenile in final stages of shedding skin, Costa Rica

PREMAPHOTOS / Egyptian spiny lizard {Uromastix aegypticus} baby in desert, Israel

PREMAPHOTOS / Egyptian spiny-tailed lizard {Uromastix aegypticus} baby in desert, Israel

PREMAPHOTOS / Cuvier's / Madagascar spiny tailed lizard {Oplurus cuvieri} Madagascar

Pete Oxford / Iguanid lizard (Oplurus cyclurus) Tsimanampetsotsa Special Reserve. South-west desert of MADAGASCAR, endemic

Pete Oxford / Iguanid lizard (Oplurus cyclurus) Tsimanampetsotsa Special Reserve. South-west desert of MADAGASCAR, endemic

Pete Oxford / Iguanid lizard (Oplurus cyclurus) Tsimanampetsotsa Special Reserve. South-west desert of MADAGASCAR, endemic

Pete Oxford / Iguanid lizard (Oplurus cyclurus) Tsimanampetsotsa Special Reserve. South-west desert of MADAGASCAR, endemic

Pete Oxford / Iguanid lizard (Oplurus cyclurus) Tsimanampetsotsa Special Reserve. South-west desert of MADAGASCAR, endemic

Pete Oxford / Iguanid lizard (Oplurus cyclurus) Tsimanampetsotsa Special Reserve. South-west desert of MADAGASCAR, endemic

Pete Oxford / Iguanid lizard (Oplurus cyclurus) Tsimanampetsotsa Special Reserve. South-west desert of MADAGASCAR, endemic

Pete Oxford / Madagascar spiny tailed lizard (Oplurus cuvieri)Ankarafantsika Strict Nature Reserve, Western dry-deciduous forest. MADAGASCAR, endemic

Pete Oxford / Madagascar spiny tailed lizard (Oplurus cuvieri) Ankarafantsika Strict Nature Reserve, Western dry-deciduous forest. MADAGASCAR, endemic.

Pete Oxford / Madagascar spiny tailed lizard (Oplurus cuvieri) Ankarafantsika Strict Nature Reserve, Western dry-deciduous forest. MADAGASCAR, endemic.

Pete Oxford / Madagascar spiny tailed lizard (Oplurus cuvieri) Ankarafantsika Strict Nature Reserve, Western dry-deciduous forest. MADAGASCAR, endemic

Pete Oxford / Iguanid lizards (Oplurus cuvieri) Two males fighting for territory. Ankarafantsika Strict Nature Reserve, Western dry-deciduous forest. MADAGASCAR . These are medium sized iguanas. This sub-group of t...

Pete Oxford / Madagascar spiny tailed lizard (Oplurus cuvieri) males fighting for territory, Ankarafantsika Strict Nature Reserve, Western dry-deciduous forest. MADAGASCAR, endemic

Pete Oxford / Madagascar spiny tailed lizard (Oplurus cuvieri) males fighting for territory, Ankarafantsika Strict Nature Reserve, Western dry-deciduous forest. MADAGASCAR, endemic

Pete Oxford / Madagascar spiny tailed lizard (Oplurus cuvieri) males fighting for territory, Ankarafantsika Strict Nature Reserve, Western dry-deciduous forest. MADAGASCAR, endemic

Rod Williams / Spiny tailed gecko {Diplodactylus ciliaris} captive, from Australia

PREMAPHOTOS / Cuvier's spiny-tailed lizard (Oplurus cuvieri) with a mass of red mites behind its head, in tropical dry forest, Madagascar

Pete Oxford / Madagascar spiny tailed lizard female digging nest (Oplurus cuvieri) Madagascar

Ashok Jain / Oil of Indian spiny tailed lizard (Uromastyx hadwickii) for sale at market, Delhi, India

Hanne & Jens Eriksen / Spiny tailed lizard (Uromastyx thomasi) Jaaluni, Oman

Philippe Clement / Spiny / Black Iguana / Black ctenosaur (Ctenosaura similis) on beach, Manuel Antonio NP, Costa Rica

Philippe Clement / Spiny / Black iguana / Black ctenosaur (Ctenosaura similis) on tree trunk, Manuel Antonio NP, Costa Rica

Philippe Clement / Spiny / Black Iguana / Black ctenosaur (Ctenosaura similis) on fig tree, Carara NP, Costa Rica

Philippe Clement / Spiny / Black iguana / Black ctenosaur (Ctenosaura similis) in fig tree, Carara NP, Costa Rica

Philippe Clement / Spiny / Black iguana / Black ctenosaur (Ctenosaura similis) in tree, Manuel Antonio NP, Costa Rica

Philippe Clement / Spiny / Black iguana / Black ctenosaur (Ctenosaura similis) in fig tree, Carara NP, Costa Rica

Piotr Naskrecki / Spinybacked Orb-weaver Spider (Gasteracantha cancriformis) their abdomen, or opisthosoma, is heavily sclerotized and armed with hard spines possibly to protect against birds and lizards, Dominican Rep...

Piotr Naskrecki / Spinybacked Orb-weaver Spider (Gasteracantha cancriformis) their abdomen, or opisthosoma, is heavily sclerotized and armed with hard spines possibly to protect against birds and lizards, Solomon Islan...

Pete Oxford / Spiny Leaf Chameleon (Brookesia decaryi) near Andringitra Massif, south central Madagascar

Robert Valentic / Northern spiny tailed gecko {Diplodactylus / Strophurus ciliaris abberans} male, Western Australia

Robert Valentic / Western spiny tailed gecko {Diplodactylus / Strophurus strophurus} Western Australia

Robert Valentic / Western spiny tailed gecko {Diplodactylus / Strophurus strophurus} Western Australia

Robert Valentic / Western spiny tailed gecko {Diplodactylus / Strophurus strophurus} Western Australia

Robert Valentic / Southern spiny tailed gecko {Diplodactylus / Strophurusintermedius} South Australia

Robert Valentic / Northern spiny tailed gecko {Diplodactylus / Strophurus ciliaris ciliaris} NT, Australia

Robert Valentic / Northern spiny tailed gecko {Diplodactylus / Strophurus ciliaris abberans} Western Australia

Robert Valentic / Soft spiny tailed gecko {Diplodactylus / Strophurus s spiningerus} endemic, Western Australia

John Cancalosi / Mountain Spiny Lizard / Yarrow Spiny Lizard (Sceloporus jarrovii), Chiricahua Mountains, Arizona, USA

John Cancalosi / Mountain Spiny Lizard / Yarrow Spiny Lizard(Sceloporus jarrovii) with blue throat (male), Chiricahua Mountains, Arizona, USA.

Juan Manuel Borrero / Spiny iguana {Ctenosaura similis} Palo Verde NP, Costa Rica

Robert Valentic / Southern spiny tailed gecko {Strophurus / Diplodactylus intermedius} female, Victoria, Australia

Robert Valentic / Northern spiny tailed gecko {Strophurus / Diplodactylus ciliaris} male, Northern Territory, Australia

Robert Valentic / Northern spiny tailed gecko {Strophurus / Diplodactylus ciliaris ciliaris} male, Northern Territory, Australia

Robert Valentic / Northern spiny tailed gecko {Strophurus / Diplodactylus ciliaris abberans} Western Australia

Jose B. Ruiz / Spiny footed lizard male (Acanthodactylus erythrurus) endemic to Iberia, Spain

Doug Wechsler / Spiny iguana (Ctenosaur) {Ctenosaura similis} Santa Rosa NP, Costa Rica

Jose B. Ruiz / Spiny footed lizard juvenile (Acanthodactylus erythrurus) endemic to Iberia, Spain

Doug Wechsler / Spiny iguana juvenile (Ctenosaura similis) Santa Rosa NP, Costa Rica

Doug Wechsler / Spiny iguana (Ctenosaura similis) Santa Rosa NP, Costa Rica

Doug Wechsler / Male Spiny iguana (Ctenosaura similis) Santa Rosa NP, Costa Rica