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Sulphur-crested Cockatoo with Beak & Feather Disease, Brisbane Australia. // Sulphur-crested Cockatoo - Cacatuidae (=Psittacidae): Cacatua (=Kakatoe) galerita. Length to 50cm (20"), wingspan to 105cm, weight to 800g. Found in Australia from the Kimberley Region in northern Western Australia, eastwards in savannah woodlands to Cape York, then south to eastern south Australia - occurs from coastal forests to inland sparse woodlands. Also in Tasmania.  In New Guinea occurs in lowland forests to about 1000m altitude, and scaattered small islands adjacent to the coast. Introduced to south-west Western Australia. Feeds on seeds and huge flocks may become a pest in agricultural areas.  IUCN Status: Least Concern.  // Beak & Feather Disease = Psittacine Beak & Feather Disease (PBFD) - is caused by a virus (Family Circoviridae) transmitted by inhalation, or direct contact with infected surfaces.  PBFD is found mainly in parrots and cockatoos, but all psittacine species may be susceptible to infection. It destroys the feather follicle, causing deformation of new growing feathers. Ultimately the follicle is destroyed, feathers are unable to form, and as the bird cannot fly death is inevitable in the wild. The beak may be deformed, as in this bird where it is laminated and elongated due to incorrect growth, and feeding is inhibited.  //Eric Lindgren//