On 7th September 2019, we observed an unusual juvenile marsh tern Chlidonias at Rochefort sewage treatment plant, Charente-Maritime, western France (plate 242). The bird was with a group of c. 30 Black Terns Chlidonias niger and one Whiskered Tern C. hybrida. It was closest in appearance to Black Tern but showed a number of features at odds with that species, suc


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