See 'Frozen' Alligators Breathing Through Ice to S
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Brumation is a term used for the hibernation-like state that cold-blooded animals utilize during very cold weather. On the other end of the spectrum is a state known as aestivation, which like brumation, provides a way for reptiles to handle temperature extremes.
https://www.youtube.com/watch?v=IZiERu3UFoM