The Crimson Rosella has distinctive crimson and blue plumage. Juveniles have green on their backs and wings. Crimson Rosellas are normally seen in small flocks
In southern and eastern Australia the red plumage can be completely replaced with a bright yellow or orange. The Yellow Rosella has the crimson areas replaced with light yellow and the tail more greenish. The Adelaide Rosella is intermediate in colour, ranging from yellow with a reddish wash to dark orange.
These are very conspicuous birds because of their vivid colours, noisy calls and tolerance of humans. Crimson Rosellas readily visit most gardens searching for seeds and fruit. They are usually found in twos or threes, but may occur in much larger groups.
This species has doubled in numbers over the survey period. The reason is not clear but is likely due to increased food supply. They are widely distributed throughout the suburbs, surrounding parks, and open wooded spaces.The Crimsons have a few mutation color mutation such as Blue, Yellow, Lutino and Silver.
In their natural habitat, they mostly feed on grass and tree seeds (including sprouted seeds that dropped to the floor and were exposed to humidity), as well as a variety of fruits, berries, flowers and nectar.
Additionally, they take insects in their larvae – particularly during the breeding season, when they require more protein in their diet.
They forage in the trees and shrubs, as well as on the ground – usually in shaded areas.