An ectotherm (from Ancient Greek ἐκτός (ektós) 'outside' and θερμός (thermós) 'heat'), more commonly referred to as a "cold-blooded animal", is an animal in which internal physiological sources of heat, such as blood, are of relatively small or of quite negligible importance in controlling body temperature. Such organisms (frogs, for example) rely on environmental heat sources, which permit them to operate at very economical metabolic rates.
An ectotherm (from Ancient Greek ἐκτός (ektós) 'outside' and θερμός (thermós) 'heat'), more commonly referred to as a "cold-blooded animal", is an animal in which internal physiological sources of heat, such as blood, are of relatively small or of quite negligible importance in controlling body temperature. Such organisms (frogs, for example) rely on environmental heat sources, which permit them to operate at very economical metabolic rates.
Source: Wikipedia "Ectotherm" · CC BY-SA 4.0
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