Marked Birds Database Manual – Using the Bird Overview screen

Marked Birds Database Manual – Working with Markers and Marker Events

The ones that that didn’t make it- IJmuiden breeding season 2018

Images of European Herring Gull Green YBXB – 2015 and 2018

Marked Birds Database update: new version scheduled for September 2018

1CY Hybrid Gull LBBG x YLG Green YCRK – June and July 2018

Adult Lesser Black-backed Gull Green YAKU with tertial spots in 2018

Comparison of underwing primary patterns in Dutch adult Herring Gulls and Lesser Black-backed Gulls – May/June 2018

Request for observations of our IJmuiden gulls ringed in season 2018

Adult Herring Gull Green YCHH with pseudo mirror, Thayeri pattern and suspended primary moult – 20180716