Principally an insectivorous bird, the white-breasted woodswallow hunts alone or in small groups. First perching conspicuously on a high vantage point to locate prey, the bird then gracefully glides over the canopy or skims low over fields, taking insects in mid-air (3) (7). The white-breasted woodswallow also has a brush-tipped (divided) tongue as a morphological adaptation for feeding on nectar (8) (9).
The breeding season of the white-breasted woodswallow varies with location, running from March until May in the northwest of its range and from August to February in Australia, where occasionally two broods may be recorded. The white-breasted woodswallow has sometimes been observed to breed cooperatively, attending to young in groups of up to five individuals (3). Both sexes help build the open-cup nest, which is placed in a tree fork, hollow branch, man-made structure or even in the abandoned nests of other species (3) (9). The nest is made of grasses, roots and twigs (9), and is unlined (3).
The white-breasted woodswallow lays clutches of two to five eggs, and the hatchlings are fed by both the adult male and female, as well as other individuals within the cooperative group. At present there is no information regarding the incubation time or nestling period of this species, but fledglings are dependent on the adults for up to 50 days or so after leaving the nest (3).
The white-breasted woodswallow is locally nomadic outside of the breeding season (3) (9), and some migratory movement is also seen from north to south in Australia (3). This species is highly sociable, roosting in large clusters of 50 to 60 birds (8) (9). By roosting in large flocks, woodswallows are able to reduce heat loss, enabling them to save energy by going into a state of torpor in harsh conditions (10). The white-breasted woodswallow is an aggressive and territorial species, and is known to mob larger birds when threatened (7).