The Australian two ounces silver piece (abbreviated as 2 oz and designated with Ag for "silver") is a bullion and commemorative coin format. Uniquely, in Australia there are two mints authorised to strike legal tender: the Royal Australian Mint (which also makes the country's circulating coinage) and the Perth Mint which only makes collector and bullion coins, as well as other bullion products.
Both mints endeavour to create coins with attractive designs, and to introduce new designs and themes often, in order to raise the numismatic value of the coins over the value of previous metal used.
This coin is part of the Australian Wedge-tailed Eagle series by the Perth Mint, and the seventh design by John M. Mercanti (the series features a new design every year).
The mint says about it:
Named for its long, distinctively shaped tail, the Australian wedge-tailed eagle has a wingspan of more than 2.5 metres. With the ability to fly tirelessly for many hours, it’s known to soar at altitudes of 2,000 metres and beyond on thermal air currents rising from Australia’s sun-baked terrain.
Portraying a wedge-tailed eagle with outstretched wings, the coin is struck in high relief with a superb proof quality finish. Adding further to the coin’s spectacular appearance, the eagle and the coins rims and serrated edge are painstakingly gilded in 24 carat gold. | 
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