Daniel Heuclin / Armadillo Lizard (Cordylus cataphractus) biting its own tail while trying to roll into a defensive ball, captive, from South Africa

Fabio Pupin / Karoo Girdled Lizard, (Karusasaurus polyzonus), black morph, covered in sea salt, Little Namaqualand, South Africa, February . Non-ex.

Fabio Pupin / Cape girdled lizard, (Cordylus cordylus), South Africa, February . Non-ex.

Fabio Pupin / Karoo Girdled Lizard, (Karusasaurus polyzonus), basking on rock, Little Namaqualand, South Africa, February . Non-ex.

Michael Hutchinson / Cape girdled lizard (Cordylus cordylus) in rock crevice, De Hoop, South Africa, December.

Michael Hutchinson / Black girdled lizard (Cordylus niger) on rock, Cape Peninsula, South Africa, December.

Michael Hutchinson / Black girdled lizard (Cordylus niger) on rock, Cape Peninsula, South Africa, December.

Chien Lee / Spiny-tailed Gecko (Diplodactylus ciliaris), Western Australia, Australia

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

ZSSD / Armadillo Lizard (Cordylus cataphractus) curled up in typical defensive posture, native to Namibia and South Africa

Michael & Patricia Fogden / Spiny-tailed Gecko (Diplodactylus ciliaris) in tree, Cape Range National Park, Western Australia

Michael & Patricia Fogden / Jean's Spinytail Gecko (Diplodactylus jeanae) threat display, Cape Range National Park, Western Australia

Michael & Patricia Fogden / Jean's Spinytail Gecko (Diplodactylus jeanae) in grass, Cape Range National Park, Western Australia

Michael & Patricia Fogden / Silver Spinytail Gecko (Diplodactylus strophurus) in tree, Nambung National Park, Western Australia

Michael & Patricia Fogden / Spiny-tailed Gecko (Diplodactylus ciliaris) close-up portrait, arboreal, Cape Range National Park, Western Australia

Joel Sartore / Photo Ark / Karoo girdled lizard (Karusasaurus polyzonus) head portrait, Omaha's Henry Doorly Zoo and Aquarium. Captive, occurs in southern Africa.

Joel Sartore / Photo Ark / Karoo girdled lizard (Karusasaurus polyzonus) head portrait, Omaha's Henry Doorly Zoo and Aquarium. Captive, occurs in southern Africa.

Joel Sartore / Photo Ark / Karoo girdled lizard (Karusasaurus polyzonus) portrait, Omaha's Henry Doorly Zoo and Aquarium. Captive, occurs in southern Africa.

Joel Sartore / Photo Ark / Black-chested spinytail iguana (Ctenosaura melanosterna) male, head portrait, IguanaLand, Florida. Captive, occurs in Honduras. Endangered.

Joel Sartore / Photo Ark / Black-chested spinytail iguana (Ctenosaura melanosterna) male, head portrait, IguanaLand, Florida. Captive, occurs in Honduras. Endangered.

Joel Sartore / Photo Ark / Black-chested spinytail iguana (Ctenosaura melanosterna) male, portrait, IguanaLand, Florida. Captive, occurs in Honduras. Endangered.

Joel Sartore / Photo Ark / Northeastern spinytail iguana (Ctenosaura acanthura) female, portrait, IguanaLand, Florida. Captive, occurs in Mexico and Guatemala.

Joel Sartore / Photo Ark / Northeastern spinytail iguana (Ctenosaura acanthura) female, head portrait, IguanaLand, Florida. Captive, occurs in Mexico and Guatemala.

Joel Sartore / Photo Ark / Roatan spinytail iguana (Ctenosaura oedirhina) male, portrait, IguanaLand, Florida. Captive, occurs in Roatan, Bay Islands, Honduras. Endangered.

Joel Sartore / Photo Ark / Yellowback spinytail iguana (Ctenosaura flavidorsalis) male, portrait, IguanaLand, Florida. Captive, occurs in central America.

Neil Aldridge / Common flat lizard (Platysaurus intermedius) male sitting on rock with with females behind, before leaving and re-entering entering frame to chase them, causing them to leave frame, Mapungubwe Nationa...

Neil Aldridge / Common flat lizard (Platysaurus intermedius) female crouched on rocks and looking around, Mapungubwe National Park, Greater Mapungubwe Transfrontier Conservation Area, South Africa.

Neil Aldridge / Common flat lizard (Platysaurus intermedius) female peering over rocks and looking around before climbing rock behind and leaving frame, Mapungubwe National Park, Greater Mapungubwe Transfrontier Cons...

Neil Aldridge / Common flat lizard (Platysaurus intermedius) female hunting for insects using its tounge on rocks, Mapungubwe National Park, Greater Mapungubwe Transfrontier Conservation Area, South Africa.

Neil Aldridge / Common flat lizard (Platysaurus intermedius) female and juveniles basking on rock, with one juvenile entering the frame to sit next to the female, Mapungubwe National Park, Greater Mapungubwe Transfro...

Joel Sartore / Photo Ark / Utila iguana (Ctenosaura bakeri) portrait, Miller Park Zoo. Captive, occurs in Bay Islands, Honduras. Critically endangered.

Joel Sartore / Photo Ark / Utila iguana (Ctenosaura bakeri) portrait, Miller Park Zoo. Captive, occurs in Bay Islands, Honduras. Critically endangered.

Joel Sartore / Photo Ark / Zimbabwe girdled lizard (Cordylus rhodesianus) tail detail, Phoenix Zoo. Captive, occurs in Zimbabwe, Malawi and Mozambique.

Joel Sartore / Photo Ark / Zimbabwe girdled lizard (Cordylus rhodesianus) portrait, Phoenix Zoo. Captive, occurs in Zimbabwe, Malawi and Mozambique.

Joel Sartore / Photo Ark / Zimbabwe girdled lizard (Cordylus rhodesianus) portrait, Phoenix Zoo. Captive, occurs in Zimbabwe, Malawi and Mozambique.

Joel Sartore / Photo Ark / Zimbabwe girdled lizard (Cordylus rhodesianus) head portrait, Phoenix Zoo. Captive, occurs in Zimbabwe, Malawi and Mozambique.

Joel Sartore / Photo Ark / Cape girdled lizard (Cordylus cordylus) portrait, Budapest Zoo. Captive, occurs in South Africa.

Joel Sartore / Photo Ark / Cape girdled lizard (Cordylus cordylus) portrait, Budapest Zoo. Captive, occurs in South Africa.

Claudio Contreras / Two Western spinytail iguana (Ctenosaura pectinata) fighting. Isabel Island National Park, Gulf of California, Mexico. March.

Claudio Contreras / Two Western spinytail iguana (Ctenosaura pectinata) fighting. Isabel Island National Park, Gulf of California, Mexico. March.