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ectotherm ecÂ·toÂ·therm (Äk'tÉ-thÃ»rm') n. An organism that regulates its body temperature largely by exchanging heat with its surroundings; a poikilotherm.
Temperature Regulation in Ectotherms. In addition to snakes and lizards, other reptiles are ectothermic, including turtles and crocodiles. Ectothermic classes include amphibians -- frogs, toads, salamanders -- and most fish and invertebrates. These animals regulate body temperature behaviorally. One strategy snakes and lizards use to acquire heat is sunning. They find a sunny spot to bask in and absorb heat from the sun. Warm rocks or other surfaces also provide heat. They cool down by burrowing, exposing themselves to the wind or finding shade.