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  1. Joern Lehmhus

    Unusual black-headed gull, Ireland (North East coast)

    https://search.macaulaylibrary.org/catalog?taxonCode=x00794 Not Bonaparte's x Blackheaded , but showing that Bonaparte's can also interbreed... I am not saying yours could be a hybrid, leifvester , but I also don´t have the experience to exclude it as we do not know which traits would be...
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