Adult Lesser Black-backed Gull Green YBJB – 20180514

Remember Lesser Black-backed Gull Green YBJB, showing black on all 10 primaries in 2017?

In one of my research projects I’m interested to find out how constant such a primary pattern is across multiple seasons.

I’m happy to find out therefore that this year, the inner primaries P1 and P2 of YBJB are ‘back to a standard pattern’, showing no black.

Both images were taken in the gull colony of IJmuiden Forteiland, the Netherlands, 8 May 2017 and 14 May 2018.

For more images of 2017, see Adult Lesser Black-backed Gull Green YBJB with black on all primaries – 20170508.

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