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a European tern, Sterna sandvicensis, that has a yellow-tipped bill, whitish plumage, and white forked tail, and nests in colonies on beaches, etc 白嘴端凤头燕鸥
During Springwatch's visit to Blakeney Point they also spotted the sandwichtern - a migrant that nests on the spit during the summer before heading to Africa in the winter.