15 April - an evening visit to Farmoor gave good views of the adult Bonaparte's Gull in the roost on F1 (upper) - slightly smaller and more delicate build than the Black-headed Gulls, with a more slender bill and a white underwing, and a slightly darker mantle. Also seen there, an Arctic Tern with the Common Terns, and at least 6 Yellow Wagtails (lower, both pics copyright Farmoor Birding).
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