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In eastern Australia, the raucous cackle of the Laughing Kookaburra is an essential feature of the dawn chorus. They can be heard laughing from the tip of Cape York south to Wilsons Promontory. The species’ occurrence in other parts of Australia, however, is no laughing matter. Kookaburras were widely introduced into Tasmania and Western Australia where they breed in tree hollows that would usually be used by parrots and owls, and they prey on small reptiles, mammals and nestlings, thus placing undue pressure on those creatures.