Nesting

There is some evidence of communal nesting by Bushtits, but it is limited to southeastern Arizona. Helpers at the nest are usually adult males. During nesting season, flocks break up, and pairs establish loose territories, although they appear to tolerate other Bushtits within their territories. Both members of the pair help build the nest. The nest is an impressive, woven, hanging basket with a hole high up on the side of the nest and a passageway to the nest chamber at the bottom. It can be up to a foot long, and is generally built of spider webs, moss, lichen, and other plant material. Inside, the nest is lined with plant down, fur, and feathers. If the pair is disturbed during the early stages of nest-building, they will abandon the nest and find a new location, sometimes finding a new mate as well. Both parents incubate the 4-10 eggs for 12-13 days, sometimes at the same time. Both brood the young and bring them food until shortly after they leave the nest at about 18 days. They generally raise two broods a year.