When they hibernate, their ECG is very complicated and their individual difference is apparent.

在冬季由于花栗鼠处于冬眠阵不同时相，其心电图变化复杂，个体差异较大。

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They hibernate during the winter cold; and their large litters help them maintain their population.

它们依靠冬眠来度过寒冷的冬季，而它们的种群则靠它们强大的繁殖力来维持。

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They can go beneath the ice, and then to hibernate as the ices closes in, until we need them to carry out their research in unreachable areas.

它们能潜入冰层下面，然后结冰时就进入冬眠，直到我们需要它们在无法到达的地方进行研究。

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Grass snakes are usually found near water and it is rare to see them during the winter when they hibernate.

BBC: Slough Crossrail workers discover sleeping snakes

In the same way, they hibernate by going into torpor, they can do the same thing on a very short-term basis through the summer - if it is wet and windy and there is no food then they just shut down their body temperature and they just sleep it out.

BBC: Yorkshire bat colonies 'cohabit all year'