英语听力：自然百科 大迁徙 Great Migrations—4

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Rain, wherever it falls, life waits for it, yearns⁴ for it, and above all, moves according to its whims⁵. Water from the skies is a reminder⁶ to all land-dwelling species that their origins were in the seas. And nowhere is this more remarkably⁷ played out than on a tiny island in the Indian Ocean called "Christmas Island".

 

Deep in the forests, far from the shores where any sensible crustacean⁸ should be, red crabs⁹, the size of dinner plates, hear the call of the monsoon¹⁰. It's time to return to the seas of their birth. With the humidity soaring, their moisture-dependent lungs can now function beyond the damp confines of the forest. The males go first, like generals at the head of a red tank division. They begin their clicking, yearly march to breed. Millions of generations have engineered these crabs for life on land, but their young must hatch in the ocean.

 

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