Author Archives: Maarten van Kleinwee

4CY Presumed hybrid Lesser Black-backed Gull x Yellow-legged Gull Green YBWP – 20180409

Marked Birds Database update: plans for the coming months

Marked Birds Database – Version 1.16.1 available

Status update on the presence of pseudo-mirrors and non-isolated mirrors in IJmuiden-ringed adult European Herring Gulls

Status update over de aanwezigheid van pseudo-spiegels en grijze inkepingen bij adulte Zilvermeeuwen van IJmuiden Forteiland

First returning Lesser Black-backed Gulls in Leiden – 20180223

Mixed breeding pair Herring Gull x Lesser Black-backed Gull in IJmuiden 2017

Gemengd broedpaar Zilvermeeuw x Kleine Mantelmeeuw in IJmuiden 2017

22CY Black-headed Gull White LYD – 20180128

Adult Lesser Black-backed Gull Green SAAL with pseudo-mirror – 20150528