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Chuckwalla
Chuckwalla are large, plump lizards that have loose folds of skin around the neck and shoulders. These diurnal lizards emerge in the morning and, before seeking food, bask in the sun until an optimum body temperature of 100 - 105 degrees F. is reached.

The Desert Food Chain
A food chain constitutes a complex network of organisms, from plants to animals, through which energy, derived from the sun, flows in the form of organic matter and dissipates in the form of waste heat.