This video says about itself:
Watch Rare Video of Bats Hibernating in Snow Dens | National Geographic Wild
24 August 2018
Ussurian tube-nosed bats spend the coldest months in snow-covered dens—the only mammal species known to do so besides polar bears.
Evidence for Ussurian tube-nosed bats (Murina ussuriensis) hibernating in snow: here.
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