英语听力：自然百科 大迁徙 Great Migrations—6

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For the surviving males, the odyssey² has just begun. The females will arrive within days, urged on by celestial³ forces demanding they reach the males and the sea in time. 

 

Like the crabs⁴, creatures around the globe are moving to the music of the spheres. They register the sun, the moon, the earth’s magnetic field and move at their bidding, even the navigational feats⁵ of the most delicate of creatures beggar the imagination and confound our understanding. 

 

And in tiny slices of endangered Mexican forest, hundreds of millions of the world's most astounding⁶ navigators are stirring. These monarch⁷ butterflies have waited patiently through the winter, barely moving, for the sun to tell them it's time. They stream to water  to slake⁸ a winter-long thirst, water that will bring spring's sexual awakening⁹. Males pluck females from the trees like reluctant flowers. And they mate.

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