因为天气太热，熊都没法冬眠了。在俄罗斯的阿穆尔地区，棕熊正处在一种尴尬的状态——它们早就贴好了秋膘，做足了冬眠的一切准备，可是温度却迟迟不降下来，它们实在睡不着。原本它们应该在10月就进入冬眠，可是直到11月，它们还半梦半醒地在外游荡。根据报道，今年的阿穆尔地区在10月和11月都出现了破纪录的高温，这不仅会延迟熊进入冬眠的时间，还会让它们提前醒来。一项研究发现，气温每上升1°C，熊就会平均提早3.5天结束冬眠。在有些温度过高、食物在冬天也很充足的地方，熊在冬天还醒着也是一件常事。阿穆尔地区的棕熊还没回到窝里，可能还有另一个原因——因为温度高于冰点，雪融化后的水会流进它们的洞穴里，熊住在漏水的家里并不舒服。不过，现在还在外游荡的更多是雄性棕熊，雌性棕熊和小熊受影响更小。小熊身体能够储存的能量更少，而且每单位体重的基础代谢率比成年熊更高。熊妈妈会格外注意，不让小熊在冬眠准备阶段消耗过多热量，因此躲在洞穴里安心进入冬眠才是最好的保护。
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