英语听力：自然百科 大迁徙之繁衍生息 Need to Breed—7

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Readying for the migration² ahead, she tongues oily secretions³ over every bit of her flight equipment. A bat's wings are essentially⁴ enormous webbed hands. Elongated⁵ finger bones providing the struts⁶ to unfold and manipulate the flight membranes⁷. 

 

As dusk settles, the migration begins. For little bats, wings spreading three feet tip to tip,blacken the skies with their departure.

 

Tonight, they have to travel many miles with their newly winged young. And inexperience on the wing will prove deadly.  

 

Parenting is risky⁸ business. Migrants around the world will risk everything for the next generation. But before you can breed, you must earn the right. And in Africa, one species readies for battle

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