The Ian Rank-Broadley (IRB) effigy of Queen Elizabeth II and the monetary denomination.

The monarchy of Australia is a form of government in which a hereditary monarch is the sovereign. Australia is a constitutional monarchy, largely modelled on the Westminster system of parliamentary government, while incorporating features unique to the Constitution of Australia.

The Australian monarch, besides reigning in Australia, separately serves as monarch for each of 15 other Commonwealth countries known as Commonwealth realms. This developed from the former colonial relationship of these countries to Britain, but they are now independent of each other and are legally distinct.

An image of a a cuddly koala clinging to the branch of a eucalyptus tree, design by Shevaun Buschenhofen (SB).

The koala is an arboreal herbivorous marsupial native to Australia. The koala is found in coastal areas of the mainland's eastern and southern regions, inhabiting Queensland, New South Wales, Victoria, and South Australia. It is easily recognisable by its stout, tailless body and large head with round, fluffy ears and large, spoon-shaped nose. Koalas typically inhabit open eucalyptus woodlands, and the leaves of these trees make up most of their diet. The eucalyptus tree is a large, fast-growing evergreen that is native to Australia and Tasmania.