an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals 同义词：poikilotherm,
An ectotherm, from the Greek εκτ?? (ektós) "outside" and θερμ?? (thermós) "hot", is an organism in which internal physiological sources of heat are of relatively small or quite negligible importance in controlling body temperature.Davenport, John.
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