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Islands in warm tropical waters don't experience seasonal extremes.
地处温暖热带海域的岛屿无法体验极端的季节变化。
The Seychelles, lying off the coast of East Africa,
位于非洲东海岸的塞舌尔群岛，
provide a sanctuary for sea birds all the year round.
是海鸟们全年的庇护天堂。
Fairy Terns are permanent residents.
塞舌尔白燕鸥是这里的永久居民。
They take a fairly relaxed view about what constitutes a nest.
它们筑巢并不讲究。
A bare branch is quite enough.
一根光秃秃的树枝就足够了。
Climbing onto it to incubate has to be done with care.
不过爬上去孵蛋需要格外小心。
Once a year, the noddies arrive.
每年白燕鸥都会来一次。
They do make nests, and Pisonia trees provide their young with a rather less precarious start in life.
它们老实筑窝，腺果藤树能让小鸟的幼年过得安全一些。
Nesting on this island looks idyllic.
在这个岛上筑巢看起来几乎完美。
But behind the beauty, there's a sinister side.
但美丽的表象后也有危险的一面。
