英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—4

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She's testing his fitness, making sure he is a good catch. He skills on the slopes show room for improvement. And now, the female invents a new challenge--a climbing contest. Her huge claws act like crampons. Being lighter² and nimbler, she has the advantage. Males can be twice as heavy reaching three quarters of a ton.

 

She's after a mate that's playful and energetic, one with strong genes³. But his chances are slipping away. She tested his performance and pushed him too far. Meanwhile, the mother with one cub⁴ is still sticking to higher ground. But deep snow is a real struggle for her little cub. She encourages him with reassuring⁵ calls.

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