英语听力：自然百科 大迁徙 Great Migrations—9

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Finally, the mothers disperse² to feed in shifts. They leave their calves³ for up to 40 minutes of every hour. They may dive up to 2 miles for a daily catch of 300 pounds of octopus⁴ and squid. This calf⁵, too young to dive, tracks his mother closely from above, listening intently for her signature clicks.

 

Chunks⁶ of octopus rise to the surface from the matriarchs hunting below like bread crumbs⁷ leading back to safety. 

 

From the depths, mother finally returns. All of this young life, the calf has been on the move. Now his mother and aunts seem to be waiting for something big. Unknown to the calf, he’s about to be welcomed into a world of giants, a world rarely seen and little understood. 

 

Migrations⁸ are "journeys of attrition. Darwinian in the extreme".

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