"They almost double their body weight before the flight," Klaassen said. "and all this fat will be burned during the flight, and they will arrive lean and exhausted in Africa."

“飞行前，它们的体重会增加一倍”克拉森说，“当到达非洲的时候，它们会变的瘦弱疲惫，因为所有的脂肪都在飞行途中被消耗掉了”。

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"They almost double their body weight before the flight," Klaassen said. "and all this fat will be burned during the flight, and they will arrive lean and exhausted in Africa."

“飞行前，它们的体重会增加一倍”克拉森说，“当到达非洲的时候，它们会变的瘦弱疲惫，因为所有的脂肪都在飞行途中被消耗掉了”。

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