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The article discusses a study which examined breeding habitat use of the Red-legged Cormorant in Argentina. Results showed that the number of active nests was positively correlated with cliff length and available area, while nest density was negatively correlated with area. Reproductive success was not correlated with any of the nesting habitat characteristics, such as height and slope. The density and reproductive success of Cormorant were higher when Rock Shags were nesting on the same cliff. Slope was the only variable that showed significant differences when differences in characteristics of sectors used by Cormorants were compared.