An organism that maintains a constant internal body temperature by regulating heat production and loss, also called an endotherm or warm-blooded animal.
From Greek 'haima' (blood) + 'thermē' (heat). The term refers to the internal regulation of temperature via metabolic processes.
Haematherms (warm-blooded animals) burn calories constantly just to stay warm—that's why mammals and birds need to eat way more often than cold-blooded reptiles!
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