Caption Group

Fig. 1. Upper: ‘American Black Tern’ Chlidonias niger surinamensis, Long Nanny, Northumberland, June 2020, Tom Tams; inset: Gary Woodburn. Lower: ‘European Black Tern’ C. n. niger, Farmoor Reservoir, Oxfordshire, April 2016, Roger Wyatt; inset: Josh Jones.

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