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Australia has about 800 species of bird, ranging from the tiny 8 cm Weebill to the huge, flightless Emu.

The exact date of the first human habitation of Australia is still a subject of considerable research. There is strong scientific evidence for a presence around 50,000 years ago, a period of massive ecological upheaval in Australia which is believed to be consistent with human colonisation. However, there is some speculation about considerably earlier arrivals, even as far as 100,000 or more years ago. These first Australians were the remote ancestors of the current Australian Aborigines, and arrived via land bridges and navigation of significant sea crossings from present-day Southeast Asia.

Australia's population has more than doubled since the end of World War II, spurred by an ambitious postwar immigration program. In the 19th century, Australia enacted strong measures to prevent immigration by nonwhites. After World War II, immigration from Greece, Turkey, Italy, and other countries increased Australia's cultural diversity. In 1973, Australia officially ended discriminatory immigration policies, and substantial Asian immigration followed. By 1988 about 40% of immigration to Australia was from Asia, and by 1997 Asians constituted about 5% of the population. The indigenous population, the Australian Aborigines and Torres Strait Islanders, make up 2.2% of the population, according to the 2001 Census. In 2001, the political campaign was dominated by issues of immigration and national security and there still remains substantial anxiety among Australians concerning immigration.

Australian immigration has a checkered history. Immigration to the continent now called Australia began over 50,000 years ago, when the ancestors of Australian Aborigines arrived via Indonesia and New Guinea. Europeans began landing in the 1600's and 1700's, and the country was colonised by Britain in 1788.

Adelaide hosted the Formula 1 Grand Prix from 1985 on 1995 on a street circuit in the city's eastern parklands. The Formula 1 Grand Prix became a source of pride and losing the Grand Prix to arch-rival Melbourne under questionable circumstances left a void that has since been filled for the most part with the highly successful Clipsal 500 V8 Supercar race event, held on a modified version of the same circuit.

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.

The land that is now Australia was first discovered by Europeans in 1522 by the Portuguese explorer Cristóvão de Mendonça, but it was only in the 17th century that the island continent became the subject of European exploration, with several expeditions sighting Terra Australis: The Dutch explorer Willem Jansz (1606), the Portuguese explorer Luis Vaez de Torres in Spanish service (1607), and the Dutch explorers Jan Carstensz (1623), Dirk Hartog and Abel Tasman (1642), after whom is named the island of Tasmania, but which he himself originally named after Anthoonij van Diemenslandt.

Australia's economic development was slow at first and based on the export of wool. This all changed with the discovery of gold in 1851 and mining has, overall, been the most important sector of the Australian economy. By the late 20th century, Australia had a prosperous Western-style mixed economy, with a per capita GDP on par with the four dominant Western European economies. In recent years, the Australian economy has been resilient in the face of global economic downturn, with steady growth. Rising output in the domestic economy has been offsetting the global slump, and business and consumer confidence remains robust. Australia's emphasis on reforms is another key factor behind the economy's strength. In the 1980s, the Labor Party, led by Prime Minister Bob Hawke and Treasurer Paul Keating, played a crucial role in modernizing Australia's economy.