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Range DescriptionPluvianellus socialis is local and partially resident in the extreme south of Chile and south Argentina, with part of the population wintering north to the Valdés peninsula, south-central Argentina, and sometimes as far as Buenos Aires province (Narosky et al. 1993, Chiurla 1996, Piersma 1996a). The population is estimated to number fewer than 10,000 birds (R. Schlatter in litt. 2002 to Wetlands International), and other estimates suggest it may be considerably smaller. Significant recent concentrations of non-breeding birds have included 145 and 123 on the Gallego and Chico estuaries respectively (Argentina) in 1999 (Ferrari et al. 2003).