In 2015, the Australian Perth Mint will commemorate the 25th anniversary of the Australian Kookaburra bullion coin series. Made from .999 fine silver, this one 1 kg coin features the original design from 1990. The kookaburra series was named after one of the most popular Australian birds, the joyously laughing kookaburra. Depicted in flight on the reverse surface of this Perth Mint-produced legal tender coin, the kookaburra strikes a handsome image. The obverse surface of silver coin bears an effigy of Her Majesty Queen Elizabeth II, Australia's head of state.