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The snow petrels have arrived and are courting.
雪海燕來了，在這里求偶。
Antarctic petrels now join the most southerly bird colony on Earth.
南極雪海燕的領地在地球的最南方
The birds have flown inland for over 300 miles to reach this breeding site.
它們往內陸飛行300英里才來到這里繁衍
Once their eggs have hatched, they will be forced repeatedly to make the 600-mile round trip to gather food in the ocean.
一旦小鳥破蛋而出，雪海燕將為覓食而不斷往返海陸600英里。
First, though, valuable nesting places must be defended from property thieves.
不過先得保護好來之不易的筑巢地，免得被其他鳥類占據。
After laying their eggs, the petrels take time out to clean their plumage.
產蛋后雪海燕會在抽出時間在雪地里整理羽毛
The south polar skua is a formidable opportunist.
南極賊鷗是可怕的機會主義者
But the skuas have not chanced upon the petrels, they've been waiting for them.
但是賊鷗碰到海燕并非機遇使然，它們早就在等著下手。
These birds do not need to go to the ocean for their food.
賊鷗不需要到海洋里捕食
The skuas can survive further south than any other predator
與其他猛禽相比，賊鷗的厲害在于它能在地球的最南端生存，
by exploiting the petrels' desperate need for bare rock.
它們知道利用海燕必定尋找裸巖筑巢的弱點。
