Once adult, Australian Ravens live as lifelong pairs in permanent territories of 150 ha. or so and apart from an occasional sortie to a nearby food glut, each pair has to rely on its territory for sustenance throughout the year. In eastern Australia their range basically coincides with grazing country, but like all our corvids, their distribution limits are constantly changing according to land use. Certain features of the map (690208) are worth noting. Aust. Ravens are largely absent from the east coast north of about Newcastle, except near Rockhampton and Townsville; likewise they are rare on the south coast between The Coorong and Melbourne, and eastwards to about Orbost. In W.A. they are only found in the south-west south of the mulga-eucalypt line. Traditionally a very wary species, they have become commensal in certain cities and towns. In Canberra Botanic Gardens they can be observed at very close quarters as they mix freely with the picnickers. They are the common corvid in Sydney and all down the NSW coast south of Newcastle.