Crimson rosellas grow to 14 inches long with males being about 15% larger than females.

They are usually known for their bright red feathers but there are 7 subspecies that come in hues of orange or yellow. All subspecies have blue cheeks, wings, and tail, with splashes of red throughout its feathers.

The crimson rosella is a medium-sized parrot native to eastern and south-eastern Australia but was later introduced to Norfolk Island and New Zealand. They are usually found in some type of forest such as tropical or subtropical, riparian, sclerophyllous, or woodlands. Crimson rosellas are rarely found in habitats without trees as they roost high in tree branches.

Crimson rosellas are omnivores; they forage in trees and on the ground for seeds, berries, fruits, nuts, termites, beetles, moths, and more. They are not useful as seed spreads as they crush the seeds before they eat them. Farmers also dislike crimson rosellas since their fruit and grain harvest can be negatively impacted by travelling rosellas.

The breeding season for crimson rosellas is around September through February but can vary with the wet season. These birds are monogamous and will nest in hollows high above the ground, lining it with its own shredding. After mating, the female crimson rosella will lay an egg every 2 days, averaging 3-8 eggs. On average, 3.6 eggs will hatch after 16-28 days where the mom will feed them for the first 6 days. After about a month, the juveniles will leave to join a flock of other juveniles.

Crimson rosellas do not talk like African grey parrots or macaws, but they can mimic whistles and songs. Outside of the breeding season, they gather in pairs or small groups chattering in loud noises ranging from high pitches to screeches. The largest group gatherings are the juvenile rosellas that can number up to 20 individuals!