a larger hollow, recorded at was considered exceptional. There are often chew marks at the entrance, which is wide. The hollow is deep and is lined with wood dust at the bottom. The female incubates her clutch of usually five, occasionally six (records up to nine), milk-white eggs. The size of each almost spherical egg is . The male attends her from a nearby tree, signalling to leave the nest for food he has brought. Information on the incubation period is limited, but is between 20 and 24 days. The nestlings are nidicolous—they remain in the nest initially, weighing at birth and gaining, on average, a day. At birth they are covered in white down, which is soon replaced by grey down. Their eyes open by 9–11 days of age, and primary quills appear by 9–15 days and primary feathers proper by 14–20 days. They are fed by the female alone for the first two weeks, then by both parents. They fledge between 30 and 37 days, generally all leaving the nest on the same day. The parents continue to feed them for another two weeks. Feeding Marri seeds are the preferred diet, but it also extracts seeds from karri (Eucalyptus diversicolor), woody pear (Xylomelum), Grevillea, Hakea, dryandra (Banksia) and sheoak (Casuarina, Allocasuarina), mangite (Banksia grandis), as well as from grasses, herbs, or shrubs associated with marri-dominated vegetation types. The beak of this parrot allows more precision to obtain seeds from a eucalypt's capsule, the tough case of marri is chewed through by the ringneck parrot or cleaved by the powerful beak of cockatoos (Cacatuidae species). The immature fruit of marri is also consumed. A grass species—wild oats (Avena fatua)—and acacia are grazed for green seed. Records of feeding on acacia seed pods include Acacia celastrifolia, A. dentifera, A. oncinophylla and A. restiacea, which occur in its range, and stripping pods for small seed of cultivated Acacia merinthophora. The nectar filled blooms of kangaroo paws (Anigozanthos sp.) are also sought out, although, unlike the honeyeater and spinebill, their weight breaks the long stalk when feeding. Any viable seed that is consumed may be undigested and dispersed. Although the red-capped parrot eats fewer introduced plant species than other parrots, it does eat the seeds of slender thistle (Carduus pycnocephalus), sheep thistle (C. tenuiflorus), and variegated thistle (Silybum marianum). The species has also adapted to exploit the introduction of orchard fruit such