An organism, especially an animal, that maintains a relatively constant body temperature through metabolic heat production; a warm-blooded animal.
From Greek 'hema' (blood) + 'thermē' (heat), referring to organisms whose blood circulation helps maintain constant body temperature through internal heat generation.
Hematotherms evolved amazing metabolic tricks—mammals burn food at incredible rates to stay warm, which is why we need to eat so often compared to cold-blooded reptiles that can survive weeks without food.
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