Kookaburra larger group known as "kingfishers", kookaburras are not closely associated with water. The genus "Dacelo" was introduced by the English zoologist William Elford Leach in 1815. The type species is the laughing kookaburra. The name "Dacelo" is an anagram of "Alcedo", the Latin word for a kingfisher. A molecular study published in 2017 found that the genus "Dacelo", as currently defined, is paraphyletic. The shovel-billed kookaburra in the monotypic genus "Clytoceyx" sits within "Dacelo". Four species of kookaburra can be found in Australia, New Guinea, and the Aru Islands. Kookaburras are sexually dimorphic. This is noticeable in the blue-winged and
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