The breeding season of jacky winters occurs from September to November. Leading up to September, singing from the males is at its highest peak, then as the nestlings are born around late September, the singing becomes quite minimal. In late October, the singing increases again, lasting until early November, when the females lay a second brood of the season. By late November with the hatching of the young, the males stop singing, making vocalisations almost non-existent from then on. It stays like this until the birds have left the area. The nesting period lasts for 15 to 20 days, while the incubation is between 16 and 18 days. Only the female will incubate the eggs, while the male will help feed the young once they have hatched. 92 per cent of the time, the female will lay only two eggs per clutch. It is uncommon for this number to vary, since many different environmental factors determine the number of eggs per clutch in order to maximize the survival rate of fledglings from the nest.Winkler, D. W. and Walter, J. R. 1983. The determination of clutch size in precocial birds. – Current Ornithology. 1: 33–68.
