Bewick's swans have black and yellow faces but each one has a unique pattern. Hundreds of them arrive to winter in England from Siberia each year. Many have been given names and can be easily identified without having to be caught.

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Source: https://www.pitara.com/non-fiction-for-kids/did-you-know-for-kids/bewicks-swans-have-black-and-yellow-faces/

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