In addition to being entangled by fishing nets, they often swallow plastic bags, mistaking them for 31 jellyfish, their main prey.
它们除了会被渔网缠住外，还常常吞下塑料袋，将其误以为是自己的主食—水母。
Polar bears, for example, are becoming endangered, as the disappearance of ice obliges them to swim farther and farther to catch seals, their main prey.
例如，北极熊越来越有灭绝的危险，因为冰的消失迫使它们游越来越远的距离去捕捉其主要猎物海豹。
Sea ice melts in summer. Without ice for a platform they cannot hunt seals, their main prey-and so they fast, eating almost nothing until ice forms in autumn.
夏季，海上冰雪消融，没有冰面作为平台，它们就无法捕食它们最主要的食物来源-海豹，所以，它们几乎不吃什么东西，禁食直到秋季冰块再次成型。
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