Racek chechtavý / Black-headed Gull - Larus ridibundus
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Results of ringing of Black-headed gulls (Larus ridibundus) at winter in Praha (Czech republic) (see volcano ;-) ) by Ivan Miksik based on ringing more than 1100 gulls. Legend: bubbles: founded "my birds" - green: at breeding period; red: next 150 days after ringing; blue: all other findings pins: birds ringed by other people - green: at breeding period; red: next 150 days after ringing; blue: at other days of year