Both sexes incubate the eggs, with the female incubating at night. Both parents incubate and feed the young, with the female doing most of the incubating. The female does up to 80-90% of incubation and all known nighttime incubating. Male and female birds share incubating and chick-rearing duties. The males of this species become aggressive once they are incubating eggs. The nesting season starts early, with some birds incubating eggs by early April. They will assist the queen in foraging and incubating the brood. Both parents take part in incubating the eggs and feeding the chicks. The female alone is responsible for incubating the eggs. Both parents take part in building the nest, incubating and feeding the young. Brooding (incubating eggs by sitting on them) is common among birds. Both parents are involved in incubating the egg and raising the young. An unusual instance of a male incubating a clutch of eggs has been reported. The cavity widens at bottom to make room for eggs and the incubating adult. While she is incubating the eggs, the male brings food for her.