Deer, foxes, rabbits, etc. are all warm blooded mammals that regularly experience sub-freezing temperatures that would kill humans in a matter of hours. How do they survive?
In: 1817
One often overlooked factor is just size. Oftentimes being large enough is adequate to stay warm. Even with a coat of insulation. Gigantothermy and thermal momentum can do a lot for an animal. Now ironically most animals large enough to benefit from this are long since extinct but you still see it in nature.
https://en.m.wikipedia.org/wiki/Gigantothermy
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