Every year three million caribou migrate across the Arctic tundra. 每年 300万迁徙的北美驯鹿 都将穿越北极苔原
Nearly half of all cubs die in their first year out on the ice. 大约有近一半的幼熊 会在第一年的冰上历险中丧生
and the thawing shifting landscape. 融化的冰雪不断改变着地貌
Further south the winter snows have almost cleared from the Arctic tundra. 在更远的北极苔原上 冬雪几乎已经完全消失
for a few miles from the coast the ice is already splitting. 离岸几英里远的海面上 冰层已经开始崩裂
Now the mother can start hunting for the seals they must have, 现在母熊将猎杀海豹 获取紧需的食物
and the mother has led her cubs a mile from the den. 母熊已经带领幼熊离巢1英里远
It's time to put them to the test. 现在该是考验它们的时候了
It's six days since the bears emerged 现在是北极熊现身后的第6天