Details of the dispersal of Black-headed Gulls Larus ridibundus ringed as nestlings in colonies in Britain and Ireland were given in Flegg and Cox (1972). That paper compared the results from an intensive study at colonies on the Rivers Medway and Swale in Kent during 1956-65 with those gathered by the national ringing scheme, now run by the British Trust for Ornithology, during 1908-69. The same


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