Galahs (Cacatua roseicapilla)
The common galah is found virtually throughout all of Australia. They congregate in flocks from 30 to 1,000 individuals and separate into pairs at breeding season, which is around August to November. They lay 2 to 6 eggs in a hole or hollow in a tree. About only 10% of fledglings survive to reach breeding age (3 or 4 years old)- most die in the first summer - however, once mature they are a long-lived bird. Galahs are seed eaters and gather most of their food from the ground.
Although at times a pest for grain growers (especially oilseeds like sunflower), they are very rarely a pest to horticulturists.
Provided the birds are prevented from establishing a feeding area, they will move on to easier pickings.