http://en.wikipedia.org/wiki/Mammal
A rare exception, the naked mole-rat, produces little metabolic heat, so it is considered an operational poikilotherm. Birds and tuna are also endothermic, so endothermy is not peculiar to mammals.
A rare exception, the naked mole-rat, produces little metabolic heat, so it is considered an operational poikilotherm. Birds and tuna are also endothermic, so endothermy is not peculiar to mammals.
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