The Black-headed Gull bird was marked at Turku, Turku-Pori, Finland [SF86] (60° 30' 0 (60.48), 22° 25' 0 (22.35)), as > 2 CY on April 5, 2009. It was first noted wintering in Zwolle (the Netherlands) on Sept 25, 2010. It was later seen at this position on January 29, 2012. It migrated over 1330 KM to its wintering site.