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
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