英语听力：自然百科 大迁徙 Great Migrations—7

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It will take five months for three generations to get the species as far north as Canada and a fourth super-generation to get them back to Mexico. Such a multi-generational migration⁴ is incredibly rare. It takes the leading generation three weeks to fly 500 miles into the southern U.S..

 

These intrepid⁵ elders sense the deaths are approaching fast. There is urgency now to pass on the migratory⁶ baton⁷. The female, having carried her eggs from Mexico, now searches for the monarch’s life-giving grail. 

 

The milkweed sprouting⁸ all around, her offspring will be laid on it, hatch on it, nurse on its toxic⁹ milk and become toxic themselves, a defense¹⁰ they will flaunt¹¹ with their singular beauty. 

 

She is dying, but with luck, her children, grandchildren and great grandchildren will carry on the journey as far north as Canada and then an astounding¹² 2,000 miles back to Mexico.

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