/ · 1894 Brewer’s · C · Cold-blooded Animals
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As a rule, all invertebrate animals, and all fishes and reptiles, are called cold-blooded, because the temperature of their blood is about equal to the medium in which they live.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.