Research on pied babblers has also provided evidence of task partitioning behaviour. In this species, the dominant pair are able to leave their dependent young in the care of helpers and initiate a new brood. This allows brood overlap: several broods of dependent young can be raised at the same time. Such a behaviour highlights the benefits of cooperative breeding: many helpers allow breeders to invest in more broods. Parents initiate this task partitioning by aggressively punishing offspring that beg at them for food. This repeated punishment results in young fledglings begging for food from helpers rather than their parents: freeing up their parents to breed again.