The green rosella or Tasmanian rosella (Platycercus caledonicus) is endemic to Tasmania and Bass Strait islands. At 37 cm (14.5 in) long it is the largest species of the rosella genus, Platycercus. The male and female are generally similar in plumage, being predominantly black, green, and yellow in colour with a red band above the beak and blue cheeks; however, some females have red-orange colouration on the front of their necks. Its diet is composed of seeds, fruit, berries and flowers, as well as insects and insect larvae.
Measuring 37 cm (14.5 in) in length, the adult green rosella has a yellow head and underparts with blue cheeks and red frontal band above the beak. The feathers of the back and wings are black with narrow green margins, the is rump yellow-olive, and the long tail is green with blue outer feathers. The wings are green and violet blue. The irises are dark brown and the bill is pale-grey. The legs are grey. The male and female have similar external appearances, except the female may have an orange-red hue in the feathers on the front of the neck, and the female has a smaller beak than the male. and Juvenile birds have an under-wing stripe, which is not present in the adults. Juveniles have dull yellow-green head and underparts and dull green upperparts.