
(ek″to-thur´me) the regulation of body temperature by the external environment, so that thermoregulation can be accomplished only by the organism's own behavior (such as moving into a different environment). poikilothermy.
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http://www.encyclo.co.uk/local/21001

ectotherm, ectothermy A cold-blooded animal; that is, an organism that regulates its body temperature largely by exchanging heat with its environment; such as, a reptile, amphibian, or fish.
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http://www.wordinfo.info/words/index/info/view_unit/4265/4

Ectothermy is the ability of an organism maintain their body temperature by absorbing heat from their environment. They obtain heat either via conduction (by laying on warm rocks and absorbing the heat through direct contact, for example) or by radiant heat (by warming themselves in the sun). Groups of animals that are ectothermic include reptiles,...
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https://www.thoughtco.com/glossary-of-zoology-terms-130928
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