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Aspects of the biology of the Kalahari Scrub-Robin (Cercotrichas paena) were studied in the Polokwane Nature Reserve, South Africa, from June 2004 to March 2007. Pairs occupied permanent territories ranging in size from similar to 0.7 to 4.3 ha. The breeding season in the study area extended from August to February, with a peak in November that coincided with the peak of the wet season. The mean clutch-size was 2.1 but there was seasonal variation, with mean clutch-size significantly larger in the later part of the breeding season compared with the early and mid-parts of the season, and there was no significant difference between the early and mid-seasons. Females were responsible for construction of nests and incubation, but both sexes fed nestlings and fledglings. The maximum number of known breeding attempts by a pair in a season was eight, of which two were successful. The Kalahari Scrub-Robin is the first African robin for which triple-brooding was recorded, and the most young. edged by a single pair in one season was seven. The mean incubation and nestling periods were 12.5 (n = 11) and 11.9 (n = 28) days respectively. Growth patterns of nestling are described with reference to mass, head-length and tarsal length. The period of dependence after. edging was 4-6 weeks. The overall breeding success was 27.1% and the mean number of young. edged per pair per annum was 2.8.