Nests are built in a large natural cavity or old woodpecker hole, usually 15-60' above the ground. Rarely use bird houses and may sometimes excavate own cavity.
Female builds the nest in the cavity, a simple cup of bark fibers, grasses, twigs and hair. Adults may spend minutes at a time sweeping the outside and inside of the nest with a crushed insect held in bill. Chemical secretions of insects may help repel predators.