Caption Group

Fig. 4. Top (left to right): American Black Tern, Long Nanny, Northumberland, May 2022, Chris Cummings; July 2022, Eric Barnes; May 2022, Chris Cummings. Middle (left to right): American Black Tern, Idaho, USA, May 2022, Tom Baumgart; Michigan, USA, May 2022, Ben Lucking; Wisconsin, USA, June 2010, Geoffrey Hill. Bottom (left to right): European Black Tern, St Aidan’s RSPB, West Yorkshire, May 2019, Nathaniel Dargue – although this bird shows a white leading edge to the wing, it is relatively thin and does not reach as far as the bird’s alula; Cranmere, Shropshire, May 2019, Richard Moores; Farmoor Reservoir, Oxfordshire, April 2015, Roger Wyatt.

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