Caption Group

Fig. 2. Top left: European Black Tern, Grau de Piémanson Provence-Alpes-Côte-d’Azur, France, July 2018. Thomas Galewski Top right: European Black Tern, Pays-de-la-Loire, France, July 2013. Frantz Delcroix Bottom left: American Black Tern, McCurtain, Oklahoma, USA, July 2012. Brian Davis Bottom right: American Black Tern, Chippewa, Michigan, United States, July 2021. Sue Kurtz. Most American Black Terns show an even scattering of white feathers around the face (bottom left), although many European birds also show this feature (top left). Conversely, while newly moulted white feathers limited to rear lores, throat and area below the eye would be more suggestive of European Black Tern (top right), a similar pattern can be shown by a small percentage of American birds (bottom right).

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