This Black-headed Gull was marked as > 2CY male near ZB.Przykona, Radyczny, Prykona, in Poland (52°0'0.0''N, 18°39'0.0''E) on May 9, 2010. I saw it in France, near Saint Cast le Guildo, in Brittany (48°38'32.8''N, 2°18'31.8''W), which is approximately 1525 km WSW of the ringing place. It had never been reported in the meantime.