We present data on the breeding behaviour of a population of southern house wrens (Troglodytes aedon bonariae; Aves) in eastern Argentina during the breeding seasons of 2007, 2008, 2009 and 2010 (October-January).  The data correspond to two sites with different risk of nest predation.

Data was collected from a house wren population breeding in nest boxes during the 2007–2010 breeding seasons (October–January) in an area
near the town of General Lavalle (36°25′S, 56°57′W), Buenos Aires province, Argentina. The most relevant aspects of the reproductive activity (clutch size, clutch size, fledging success, number of fledglings) of individuals of this species were recorded through intensive systematic monitoring of nests during the breeding seasons from 2007 to 2010. Many of the individuals from these nests were captured prior to the start of nesting and marked with combinations of coloured plastic rings and a numbered aluminium ring.

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