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On 13.05.2006 on Paczkowski reservoir (Upper Silesia voivodship) we did first record of mixed brood of female Herring Gull Larus argentatus with male Caspian Gull Larus cachinnans in Silesia. In nest we found 3 eggs. Parents were observed again on 21 and 27.05 and at the same time 3 small nestlings were spotted in nest. Herring Gull was banded and thanks to that it was known that she was ringed on 19.05.2001 in Tarnów (Małopolskie voivodship) as small chick (wing length 40 mm) in Caspian Gullsfatcat:6f67v4rczvfc7ehvjdcz775u3u