 The noisy miner has some of the largest group sizes of any <unk> breeding bird , with up to twenty males and one female attending a single brood . Only males help with a nest , and while many birds may be associated with a particular brood , some males devote all their time to a single nest , while others spread their helping efforts across five or six nests . <unk> evidence and genetic testing indicate that helpers are male offspring of the breeding pair , or full siblings of the male parent . Males nearly always bring food to the nestling singly , and if several arrive at once one will pass food to a nestling while the others wait . The female leaves the nest quickly when a male bird arrives , and never takes food from one of the helpers . Communal feeding of the young increases after fledging , and the young beg for food with constant ' chip chip ' calls and <unk> mouths . The female rarely feeds the young birds after they have fledged . 
