Request for info about arrested primary moult in Herring Gulls

While studying Herring Gulls in a Dutch colony during the breeding season I have come across various examples of arrested (inner) primary moult in adults.

To my knowledge, very little is known about this in this species.

In preparation of an article about my findings I’m looking for examples or references in literature for European, Scandinavian or American Herring Gull.

If you know of any, I would be very interested.

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