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People have been visiting this cave for generations. The cave floor is covered in guano, so plentiful that ten minutes' work can fill these farmers' baskets.
數代的人持續受到洞穴的恩澤，洞穴地底覆蓋了滿滿鳥糞。僅僅十分鐘時間就能讓農人滿載而歸。
It's used as a valuable source of fertiliser. A clue to the source of the guano can be heard above the noise of the river.
這是一種寶貴的天然肥料。鳥糞的源頭能聽到河水上空的鳥鳴。
The sound originates high up in the roof of the cave.
噪音因為山洞而被放大。
The entrance is full of swifts. They're very sociable birds. More than 200,000 of them share this cave in southern Guizhou Province, the biggest swift colony in China.
入口處聚滿了雨燕。他們是社交性動物。約200000多的雨燕共享貴州南部的洞穴。這里是中國最大的雨燕棲息地。
These days, Chinese house swifts mostly nest in the roofs of buildings, but rock crevices like these were their original home, long before houses were invented.
如今，中國的家燕多數將巢穴建在建筑物的屋頂，但其實在房屋被發明出來之前，這樣的巖縫才是他們原本安家的地方。
