June 2021 – vol. 114, issue 6, pp 360–361 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... This article is only available to registered users.To read more, please log in or purchase a subscription.