Five nests of the Redstart (Setophaga ruticilla) were studied at Douglas Lake, Michigan, in late June, July, and August, 1942. The preferred habitat was second-growth maple, but nests were found in every kind of forest. Little territorial defense was observed. The males were in full song until mid-July, when song gradually decreased, stopping in early August. Only the female was observed to incubate or brood. Except at one nest, male and female shared in feeding the young. Incubation intervals averaged 22.1 minutes, brooding intervals, 9.1 minutes; intervals between feedings, 12.3 minutes. Fecal sacs were eaten during the early part of the nestling period; later they were carried away.