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The population status of southern sea lions (Otaria flavescens) in southern Argentina (provinces of Santa Cruz and Tierra del Fuego) was last assessed between 1946 and 1949, when there were 49 colonies with 84,714 individuals and a production of 12,658 pups recorded. To update the population size and pup production a new series of surveys was carried out during 1992 and 1997, either from land, airplane...