It’s actually a rare silver mutation of a Diamond Firetail.
It’s one of three firetail finches from the genus Stagonopleura, all of which are endemic to Australia.
The other two are the red-eared firetail (Stagonopleura oculata), found in the southwestern corner of Australia, and the beautiful firetail (Stagonopleura bella), endemic to the southeastern corner of the country.
Ranging from Newcastle to Kangaroo Island, the beautiful firetail is also found throughout Tasmania. In fact, it’s the only finch species that occurs naturally on the island.