A warm-blooded animal; an organism that maintains its body temperature through internal metabolic processes.
From Greek 'haima' (blood) + 'therme' (heat), literally 'warm blood,' an older term for what we now call endothermic animals.
The term 'haematotherma' is an old-fashioned way of saying warm-blooded, but it perfectly captures why mammals and birds can stay active in winter—their blood circulation generates and distributes heat throughout their bodies.
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