The ivory gull often follows polar bears to feed on the remains of seal kills.
象牙海鸥经常跟

熊的后面吃剩下的海豹尸体。
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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
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。