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Endotherm and Ectotherm

Description
Endotherm and ectotherm. Photo of a chameleon (an ectothermic lizard) being held by a human (an endotherm). It was taken using heat-sensitive film. The lizard blends into the background because it is about the same temperature as its surroundings. The human is warmer than its surroundings because he or she is producing a large amount of metabolic heat.
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