Description
Ranging in size from 26–37 cm (10–14.5 in), rosellas are medium-sized parrots with long tails. The feathers on their backs show an obvious scalloping appearance with colouring that differs between the species. All species have distinctive cheek patches. Sexual dimorphism is absent or slight - males and females generally have similar plumage, apart from the Western Rosella. The juveniles of the blue-cheeked species, and Western Rosella, all have a distinctive green-based plumage, while immature plumage of the white-cheeked species is merely a duller version of the adults.
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