英语听力：自然百科 大迁徙 Great Migrations—17

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That is the fierce logic³ of migrations⁴. But what is logical for the many can be madness for the few.

 

At the Mara River, the madness has begun. The crocodiles, from long experience, know who to target--the young. Calves⁵ strain to stay by their mother sides to no avail. Powerful sharp hooves descend⁶ on the reptiles⁷ again and again. On the far banks, wrenching⁸ scenes of those who almost made it, watched helpless by distraught mothers.

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