Visit to the gull colony of IJmuiden – 20170410

5CY Lesser Black-backed Gull Green YBMT with retarded plumage – 20170410

Lesser Black-backed Gull YCDP taken into care and released again – Spain, April 2017

Marked Birds Database – Version 1.10.0 available

2CY Iceland Gull – 20170310

Black-headed Gull White ECM9 displaying courtship and territorial behaviour – 20170304

Variation in primary moult in Lesser Black-backed Gulls in January

Adult Herring Gull still looking after young in February – 20170218

Sub-adult Herring Gulls showing pair-bonding behaviour? – 20170217

Marked Birds Database – Version 1.9.1 available