Geringde Kokmeeuwen Larus ridibundus in de winter in Eelde

Of ten ringed wintering Black-headed Gulls in the village of Eelde, ring numbers were routinely read with spotting scope or binocular. Three were ringed in Denmark, one in Estonia, one in Lithuania, one in Finland and four in The Netherlands (Table 1 and 2). Among the Dutch birds, only a single individual was ringed as a nestling, the other three were captured in winter and may have originated from the Baltic as well. Some birds showed a high site fidelity, returning to Eelde each winter and staying there from early August (1Y5), early November (3556894) or early December (3501571) through mid-February or early March. Other birds were more mobile (with other observations in the city of Groningen) or were seen only once or twice.