The Australian magpie produces a clutch of two to five light blue or greenish eggs, which are oval in shape and about . The chicks hatch synchronously around 20 days after incubation begins; like all passerines, the chicks are altricial—they are born pink, naked, and blind with large feet, a short broad beak and a bright red throat. Their eyes are fully open at around 10 days. Chicks develop fine downy feathers on their head, back and wings in the first week, and pinfeathers in the second week. The black and white colouration is noticeable from an early stage. Nestlings are usually fed exclusively by the female, though the male magpie will feed his partner. Individual males do feed nestlings and fledglings, to varying degrees, from sporadic to equal frequency to the female. The Australian magpie is known to engage in cooperative breeding, and helper birds will assist in feeding and raising young. This does vary from region to region, and with the size of the group—the behaviour is rare or nonexistent in pairs or small groups.