Black-headed Gull - (Larus ridibundus) - with its length 38 cm and about 200 grams is comparable to the size of pigeons. Adult males are dressed in hnízdním bluish-gray backs and wingtips are black in color. The head is the neck chocolate brown. Beak and legs are red. In the winter clothes, only the head is white with black spots on the eye. Juveniles are to head back more or less brown. The tail end black tape. Beak and legs are pale yellow. They nest in colonies from April to June every year. The nest is made rostliným material. The female lays 2 to 3 eggs olive green brown speckled eggs. Time session is 22 to 23 days. Chicks are fed with approximately six weeks. Sexually mature at 2 year of life. Food consists of insects, worms, etc.. Numerical conditions are steadily decreasing. In the census in 2001 - 2003 levels then decreased to about 50 000 - 100 000 breeding pairs. Black-headed Gull is partly migratory birds.

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