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視頻出處：
本影片片段來自《非洲》
But the birds need to be careful,
但鳥兒們需要加倍小心
for the sun has played a terrible trick.
因為太陽開了一個可怕的玩笑
This oasis is poisonous.
綠洲里的水是有毒的
Intense evaporation over thousands of years
上千年的劇烈蒸發
has left the water saltier than the sea.
使得此片水源的鹽度超過了海水
As if to underline the horror,
更為恐怖的是
the place is infested by vast swarms of flies.
大量的蒼蠅聚集于此
But this plague is a birds' salvation.
然而這些疫蟲是候鳥們的救星
The flies are filled with freshwater, filtered from the brine.
它們能將鹽水過濾 使體內充滿淡水
So, like a desert wanderer squeezing a drink from a cactus,
就像沙漠迷途者擠壓仙人掌攝取水分那樣
the birds get all the water they need from the flies' bodies.
鳥兒們通過捕食蒼蠅來獲取淡水
More and more migrants join in.
越來越多的候鳥加入了捕食行列
Wagtails.
比如鹡鸰
