This Lesser Black-backed Gull was ringed as pullus on June 30, 2007, near Amrum, Odde, Germany (54 42 N, 08 21 E). I saw Y[H.501] on March 13, 26 an 27 at the same spot in Leiden. It reappeared in autumn, and I saw it on October 22, 2011, and September 2, 2012. I saw it again on November 2nd, 2013 in Leiden and on September 9, 2015 in Katwijk.