The Arctic mammals, known as "sea unicorns" thanks to their single long tusks, also transmitted measurements for the winter layer of surface water that shields sea ice from the warmer waters below.

这种因为长着一根长牙而被称为“海洋独角兽”的北冰洋哺乳动物，同时还传输冬季海水表面的温度，这层海水将海面冰层和下面温暖的海水隔离开来。

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How does this particular layer of Prague Winter unfold?

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Before they set hoof onto the snow they have to undergo a change of shoes, a feat made possible by farrier Christian Lampert, who replaces regular shoes with a set containing winter grips and a unique layer of silicone to prevent snow sticking to hooves.

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It's another layer of protection against the cold of winter.

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