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Information was collected from a small population of peafowl living in Mansion House Historic Reserve, Kawau Island, from 1995 to 2010. Peacocks used an exploded lek breeding system, and displayed at areas where human and natural foods occurred. Mating took place between late Sep and mid Dec. Breeding was successful in the presence of a substantial North Island weka (Gallirallus australis greyi) population. An average of 1.4 (SE = 0.6, n = 10) young were fledged per successful clutch. In the winter of 2004, all peahens disappeared and the population thereafter comprised only males. Despite the absence of females, peacocks continued to display for 5 years after all peahens were lost. The breeding biology of this introduced population appears to be similar to that in their native range.