Marked Birds Database – Version 2.10.0 available

Marked Birds Database – Version 2.9.1 available

Marked Birds Database – Version 2.9.0 available

Eye close-ups of adult Herring Gulls and Lesser Black-backed Gulls – 20200529

IJmuiden Lesser Black-backed Gull GPS-project update: more adults fitted with loggers

Visit to the gull colony of IJmuiden – 20200511

Lesser Black-backed Gull Green YBJB primary pattern update – 2020

IJmuiden Lesser Black-backed Gull GPS-project update: juveniles on their way back and adults in the media

Marked Birds Database – Version 2.8.0 available

IJmuiden Lesser Black-backed Gull GPS-project update: return of more adults