為在阿拉斯加的嚴冬生存，北極地松鼠會冬眠半年以上。但氣候變化影響了土壤溫度，令牠們的冬眠期變短，而且雌性會比雄性更早甦醒。在這情況下， 雌性可以消耗較少的儲存脂肪過冬，並且能提早開始覓食，但同時亦會增加牠們被捕食的機會。與雄性於不同時間甦醒亦可能會影響牠們的繁殖機會。

Arctic ground squirrels are able to survive in extreme winter in Alaska by hibernating for over half the year. However, their hibernation period is shorter  because climate change affected the soil temperature, and females emerge earlier every year while males are not. This allows the females to use less stored fat during hibernation and can begin foraging earlier; but this might create bigger chance for them to become food for other predators, and not emerging with the males might affect their reproduction chance as well.

https://scitechdaily.com/new-study-reveals-how-climate-change-can-change-hibernation-patterns/