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As the ice disappears, seabirds return to the high Arctic.
冰融化的時(shí)候，海鳥返回到北冰洋。
Little auks arrive in their millions.
小海雀成千上萬地飛來。
In some ways, these birds are the penguins of the north.
在一些人的眼里，這些海雀是北極的企鵝。
They seek bare rock on which to lay their eggs and they look rather like penguins, too.
它們尋找裸巖，好在上面產(chǎn)蛋，它們長得也有幾分像企鵝。
Unlike Antarctica, the Arctic can be reached by land-based predators,
與南極不同，陸基的掠食動物也可以到達(dá)這里，
which is why little auks have kept the ability to fly.
所以小海雀仍然需要保持飛行能力
They use scree slopes to protect their eggs, burrowing up to a metre beneath the rocks.
它們利用巖肖山坡保護(hù)鳥蛋，蛋藏在巖石下的深達(dá)1米的縫隙里。
At the height of summer, the sun never sets, but just skims the horizon before rising again.
盛夏的太陽從不落山，只是滑落在地平線上，再次升起。
Migrants return to the Arctic from far and wide.
候鳥們從世界各地返回北極。
They've come to make the most of the brief flush of food and to produce their young.
它們來尋找美食和繁衍后代。
Sandhill cranes have travelled all the way from New Mexico.
沙丘鶴則從新墨西哥州一路趕到這里。
Their chicks join the growing band of youngsters exploring the tundra.
它們的小鳥跟其他小鳥一起探索凍土地帶。
