Iguanas

Iguanas, being cold-blooded reptiles, rely on the sun's heat to regulate their body temperature. They absorb thermal energy from the sun, which travels to Earth as infrared radiation. As iguanas warm up, they change color from purple to golden, a process visible through special cameras. This heat storage allows them to dive into cold water to feed on algae, where they lose heat through conduction and convection. Upon returning to land, they rewarm by lying on sun-drenched rocks, regaining enough heat to continue their activities.

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