The thorny dragon or thorny devil (Moloch horridus) is an Australian lizard, also known as the mountain devil, the thorny lizard, or the moloch. This is the sole species of genus Moloch. The thorny dragon grows up to 20 cm (7.9 in) in length, and it can live for up to 20 years. Most of these lizards are coloured in camouflaging shades of desert browns and tans. These colours change from pale colours during warm weather and to darker colours during cold weather. These animals are covered entirely with conical spines that are mostly uncalcified.
The thorny dragon also features a spiny “false head” on the back of its neck, and the lizard presents this to potential predators by dipping its real head. The “false head” is made of soft tissue. The females are larger than the males. The thorny dragon’s scales are ridged, enabling the animal to collect water from any part of its body. That water is then conveyed to its mouth.
An intimidating array of spikes covers the entire upper side of the body of the thorny dragon. These thorny scales also help to defend it from predators. Camouflage and deception may also be used to evade predation. This lizard’s unusual gait involves freezing and rocking as it moves about slowly in search of food, water, and mates.
The thorny dragon usually lives in the arid scrubland and desert that covers most of central Australia. For example, it inhabits the Spinifex (Triodia) sandplain and sandridge desert in the deep interior and the mallee belt.
The habitation of the thorny dragon coincides more with the regions of sandy loam soils than with a particular climate in Western Australia. source