The ivory gull often follows polar bears to feed on the remains of seal kills.
象牙海鸥经常跟在北极熊
后面吃剩下
海豹尸体。
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9 On the decline in the countryside, they are experiencing a resurgence in urban gardens because these days gardeners are buying lots of different plants which means there's an extensive range of seeds around, which is what they feed on.
它们在城市的花园里再现,在乡村的数目减少了,因为现在的园丁买了许多不同的植物,这意味着有很多种类的种子供它们食用。