A wet Rainbow Lorikeet changes colour because of the differences in feather types- either pigment-related or structural-related. In this lorikeet the colour of predominantly green feathers , such as on the back and wings, comes mainly from the micro-structure of the feather barbules that interferes with light wavelengths changing one colour to another; When molecules of water in the rain fill in the micro-structures of the barbules the appearance of the green colour alters to brown. Pigment-based feathers are not affected, unless they have both pigmented and structural attributes. When dry this bird will return to its normal gaudy plumage. // Rainbow Lorikeet - Psittacidae: Trichosurus haematodus. Length to 30cm; wingspan to 45cm; weight to 150g; Found in northern and eastern Australia from the Kimberley Region in northern Western Australia (Red-collared Lorikeet) to eastern Siouth Australia. Occurs in forests, woodlands, heath, and rural and urban areas. Aviary-escapees are established in many towns and cities. Widespread with many subpsecies - often with a different name - from eastern Indonesia through New Guinea east to Vanuatu and New Caledonia, northto Manus and the Admiralty Islands just south of the equator. (The Philippine Islands form may also be a subspecies but the taxonomy of the group is not yet finalised).