Blue-winged kookaburra highly aggressive in the first week of life, and the youngest chick is often killed by the older chicks during this period. Once fledged, juvenile birds need to be taught how to hunt by their parents for a further 6–10 weeks before they can properly fend for themselves. The red goshawk and rufous owl prey upon the blue-winged kookaburra. Adult birds are also slow flyers and vulnerable to being hit by cars on country roads. Nests are susceptible to raids by Olive Pythons, quolls and goannas. Blue-winged kookaburra The blue-winged kookaburra ("Dacelo leachii") is a large species of kingfisher native
Australian Silver Kookaburra mintage of the one troy ounce coin is capped, while the others have unlimited mintage based on demand. Perth Mint originally intended to expand the 2013 mintage to one million coins, however they later reduced this number to 500,000 and declared that future years would continue to be limited to this amount. In addition to the annual design change, there is also a design change between the bullion and proof versions of the coin each year. No proof coins were minted between 2006-2011; however, there was a 1-ounce silver proof Kookaburra colored coin struck in 2012 for the Discover Australia