Robert Valentic / Phuket horned tree lizard (Acanthosaura phuketensis) near Bang Pae Waterfall, Khao Phra Thaew NP, Phuket Island, Thailand.

Mitsuaki Iwago / Thorny Devil (Moloch horridus) walking across sand, Australia

Michael & Patricia Fogden / Thorny Devil (Moloch horridus) in the desert near Ayers Rock, Uluru-Kata Tjuta National Park, Australia

Gerry Ellis / Thorny Devil (Moloch horridus) overhead view, native to the Central Desert, Western Australia

Mitsuaki Iwago / Thorny Devil (Moloch horridus) on sand, Australia

Robert Valentic / Brown pricklenape (Acanthosaura lepidogaster) female, Phong Nha-Ke Bang National Park in central Vietnam. Dry season.

Robert Valentic / Brown pricklenape lizard (Acanthosaura lepidogaster) female in karst rainforest within the Phong Nha-Ke Bang National Park in central Vietnam. Dry season.

Steven David Miller / A close up of a Thorny devil (Moloch horridus), Alice Springs Reptile Park, Northern Territory, Australia.

Robert Valentic / Peninsula horned tree lizard (Acanthosaura armata) female, Cross-island trail, Tioman Island, Malaysia.

Frederique Olivier / Thorny dragon (Moloch horridus )with Calandrinia flowers in desert habitat, Australia.

Frederique Olivier / Thorny dragon (Moloch horridus) with Calandrinia flowers in desert habitat, Australia.

Frederique Olivier / Thorny dragon (Moloch horridus) in desert habitat, Australia.