However, not all of these species cause serious damage. All these birds are protected, but open seasons have been declared for some species of parrots in some shires of the State. In areas where there are no open seasons in place, a damage licence is required from CALM before any control can take place. They are common birds of the forest and surrounding farmland of the south-west. The back and tail are green.
Females are generally duller and most have a violet-grey breast.
It is a very successful parrot having increased in number since settlement, due to improved food supplies and reliable water. Twenty-eights are mainly green with a blackish head and a prominent yellow collar . They have purplish-blue cheeks and a green, or green and yellow abdomen. There is also some blue colour in the wings and tail feathers. Both the sexes and immature birds have the same appearance.