Many of my blog posts are trip reports or contain mainly photos. Every once in a while I also write in-depth articles about specific topics. To make these articles easier to find, I will list them here separately.


Identifying nearly-fledged Herring Gulls and Lesser Black-backed Gulls in the field

Suspended primary moult in adult European Herring Gulls Larus argentatus argenteus of the Dutch colony of IJmuiden Forteiland

Deciphering the black mark on P9 of Black-headed Gulls

Bill and eye characteristics in European Herring Gulls

Primary pattern variation in individual European Herring Gull

Ring-billed Gulls vs Common Gulls: comparison from a Dutch perspective

Adult American Herring Gulls, seen from a Dutch perspective

Tertial spots in sub-adult and adult gulls

Status update on the presence of pseudo-mirrors and non-isolated mirrors in IJmuiden-ringed adult European Herring Gulls


Forward posture

Kleptoparasitic behavior in Black-headed Gulls towards Sanderlings


Are bare patches in Herring Gulls a sign of old age?


Limosa 92.2 – Mixed breeding pair Herring Gull x Lesser Black-backed Gull in IJmuiden 2017

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