Avocets feeding in compact spinning group. In early February 1990, at Big Lake in the Djoudj National Park for Birds, Senegal, large numbers of Avocets Recurvirostra avosetta were feeding normally in water some 20 cm deep. Suddenly, 150-200 of them drew together, forming an almost circular, compact group about 4m in diameter, spinning around on its own axis, the waders walking and feeding rapidly;

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