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To the visitor from the northern hemisphere, many of Australia's birds will immediately seem familiar - Australian wrens look and act very like northern hemisphere wrens, Australian robins seem to be close relatives of the northern hemisphere robins - but in fact the majority of Australian passerine birds are descended from the ancestors of the crow family, and the close resemblance is misleading: the cause is not genetic relatedness but convergent evolution.

The Australian Constitution guarantees the separation of church and state; there is no state religion in Australia. Although the nation is broadly secular and few are church-goers, three-quarters of Australians are nominally Christian, mostly Catholic or Anglican. A diverse range of other religions are practised.

Australia also has several inhabitated external territories (Norfolk Island, Christmas Island, Cocos (Keeling) Islands) and several largely uninhabited external territories: Coral Sea Islands Territory, Heard Island and McDonald Islands and the Australian Antarctic Territory.

Sydney's most famous landmarks are the Sydney Harbour Bridge and the Sydney Opera House, both of which are located on Sydney Harbour. Sydney's principal river is the Parramatta River, which enters Sydney Harbour from the west. While the Harbour is famous for its racing yachts, the Boxing Day start of the Sydney to Hobart Yacht Race and 18ft skiffs, the river is used for dinghy sailing and rowing as well as recreational boating, racing small yachts, recreational fishing, and occasional Dragon Boat racing.

Many raw materials (including resources postulated to exist but yet to be discovered) remain mostly unexploited. Australia is often referred to by economists as the "world's farm", but despite this emphasis on the agriculture sector, in recent years the Australian government has been focusing on the tourism, education and technology markets.