Author Archives: Maarten van Kleinwee

5CY Lesser Black-backed Gull Black/Blue 3P with sub-adult marking in secondaries – 2018

IJmuiden Forteiland gull season 2018

Primary pattern comparison in Dutch adult Common Gulls

Marked Birds Database – Version 2.0.0 available

1CY Leucistic European Herring Gull, brown aberration – September 2018

Marked Birds Database Manual

Marked Birds Database Manual – Working with life histories

Marked Birds Database Manual – Working with observers

Marked Birds Database Manual – Using the Observation Details screen

Marked Birds Database Manual – Working with images