原生态地球
EARTH UNPLUGGED
在冰穴中出生
Born in the ice den.
北极熊幼仔
Tiny polar bear cubs
会成长为陆地上最大的食肉动物
will grow to be the largest land carnivore.
神奇的动物宝宝
Amazing animal babies.
出生2到3个月都舒舒服服地生活在冰穴里
Nursed in the den for 2 to 3 months.
春天钻出地面 体重会达到10到15公斤
Emerge in spring weighing 10 to 15 kilogrammes.
平均每窝两只
Average litter size is two.
厚实的毛和皮下脂肪让它们足以抵御北极的严寒
Thick fur and blubber keeps them warm.
北极熊一家会在洞穴里待大约15天
Family spend around 15 days at the den.
幼仔学着在雪地上走
Cubs learn to get around in the snow.
还开始淘气啦
And start to play.
北极熊妈妈大概已经有8个月没有进食了
Mum may not have eaten for 8 months.
幼仔跟着她
So the cubs follow her…
到海面浮冰上捕食
…to the sea ice to hunt.
两年半的时间里 他们都会跟着母亲
They’ll stay with mum for 2 and a half years.
这之后再一起结伴生活几个月
And as a pair for several more months.
一起行动 一起觅食
Travelling and sharing food.
最终他们（就会离开妈妈）独自生活
Eventually they will go it alone.
学会如何
Adapted to survive
在这一片不毛严寒之地生存下来
…in one of the world’s harshest places.
BBC地球系列
BBC Earth Productions