Reaching a total length of 16 inches (40 centimetres) and a weight of 2 pounds (0.9 kilograms), Chuckwallas are noted for their wide, flattened midsections and prominent paunch. Their tails are also notably thick, tapering to a blunt tip. Loose folds of skin characterise the neck and sides of the body, which is covered in small, coarsely granular scales. Males are generally larger than females. Sexual dimorphism is marked, with males having reddish to orange, yellow or light gray bodies and black heads, shoulders and limbs; females and the immature have bodies with scattered spots or contrasting bands of light and dark in shades of gray or yellow.
Well-developed femoral pores are located on the inner side of the thighs in males; these pores produce secretions believed to play a role in marking territory.
Harmless to humans, these lizards are known to run from potential threats; a tight rock crevice is sought wherein the Chuckwalla will inflate its body with air in order to entrench itself.
Males are seasonally and conditionally territorial; an abundance of resources tends to create a hierarchy based on size, with one large male dominating the area's smaller males. Chuckwallas use a combination of colour and physical displays, namely "push ups", head-hobbing, and gaping of the mouth to communicate and defend their territory (see animal communication). In lean periods no territories are observed.
Chuckwallas are diurnal animals and as they are exothermic, spend much of their mornings and winter days basking. These lizards are well adapted to desert conditions; they are active at temperatures of up to 102°F (39°C). Chuckwallas hibernate during cooler months and emerge in February.
Mating occurs from April to July, with 5-16 eggs laid between June and August. The eggs hatch in late September. Chuckwallas may live for 25 years or more.:smile: hope this helps:smile: