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Australia is home to the only three extant monotreme species in the world - two echidnas and the Platypus. The only placental mammals naturally found on the Australian mainland are bats; a large number of rodents which arrived only about 5 million years ago, and the Dingo, which was introduced to Australia by humans perhaps 7000 years ago.

Australia may have been sighted by Portuguese sailors in 1601, and Dutch navigators landed on the forbidding coast of modern Western Australia several times during the 17th century. Captain James Cook claimed it for Great Britain in 1770. At that time, the native population may have numbered 300,000 in as many as 500 tribes speaking many different languages. The Aboriginal population currently numbers more than 300,000, representing about 1.7% of the population. Since the end of World War II, efforts have been made both by the government and by the public to be more responsive to Aboriginal rights and needs.

Since the end of World War II, the population of Australia has more than doubled; non-European immigration, mostly from the Middle East and Asia, has increased significantly since 1945 through an extensive, planned immigration program. From 1945 through 1996, nearly 5.5 million immigrants settled in Australia, and about 80% have remained; nearly one of every four Australians is foreign-born. Britain and Ireland have been the largest sources of post-war immigrants, followed by Italy, Greece, New Zealand, and the former Yugoslavia.

The Commonwealth of Australia is a constitutional monarchy: Queen Elizabeth II is the Queen of Australia, a role distinct and separate from her position as Elizabeth II of the United Kingdom, and is considered to be the head of state, although that term is found nowhere in the Constitution or the law. The Queen is nominally represented by the Governor-General - in practice virtually the entire constitutional role of the monarch is performed independently by the Governor-General. Under the Australian Constitution the role of the monarch is almost entirely ceremonial. Although the constitution theoretically gives very extensive executive power to the Governor-General, these powers are virtually never used directly, and are delegated to the Cabinet, whose members are chosen by the governing party or by the Prime Minister alone, from amongst the current members of the parliament.

Despite the best intentions of government health schemes and cultural marketing initiatives, the traditional Australian palate is amply serviced by an extensive takeaway food industry.

Van Diemen's Land (i.e. the present day Tasmania) was settled in 1803, and became a separate colony in 1825. The rest of the continent, what is now Western Australia, was formally claimed by the United Kingdom in 1829. Following the spread of British settlement, separate Colonies were created from parts of New South Wales: South Australia in 1836, Victoria in 1851 and Queensland in 1859. The Northern Territory was founded, as part of the Colony of South Australia, in 1863.

In common with many other developed countries, Australia is currently experiencing a demographic shift towards an older population, with more people retiring and fewer people of working age. Similarly, a large number of Australian citizens (950,000 as of 2004) live outside of their home country. This number (almost 5%) represents a higher per capita percentage of overseas residents than many other countries including the United States. This phenomenon was, until recently, given little attention by the Australian government and media, but the term Australian Diaspora has now joined the Australian vocabulary.

Chinese and Asian restaurants provide eat-in and takeaway services, and once again they cover the gamut from Europeanised 'faux' Asian food (soggy sweet-and-sour chicken) to the authentic. Most Australians prefer the genuine article, and the number of high-quality Asian restaurants is increasing.

Most of the Australian population descends from 19th and 20th century immigrants, most from the UK and Ireland to begin with, but from other sources in later years. Although the Australian colonies were founded as a penal colonies (except for South Australia and Western Australia - with the latter later receiving convicts), the transportation of British convicts to Australian colonies was gradually phased out between 1840 and 1868. During the "gold rush" of the late 19th century, the convicts and their descendants were rapidly overshadowed by hundreds of thousands of free settlers from many different countries: for example, in the 1850s about two per cent of the combined populations of Britain and Ireland emigrated to New South Wales and Victoria.

Australian flora, in order to cope with the extreme conditions present in much of Australia, has evolved to cope with a common set of conditions, namely the ubiquitous presence of fire; soils low in nutrients (due to a lack of recent - geologically speaking - volcanic activity); and a lack of water.