 In breeding areas, breeding pairs defend territories against other brolgas, and when breeding efforts are successful, remain in territories with one or two chicks.Nonbreeding birds that constitute young birds of past years, as well as adults that likely do not yet have breeding territories, are also found in breeding areas, likely throughout the year.In the nonbreeding season, they gather into large flocks, which appear to be many self-contained individual groups rather than a single social unit.