The Australian zebra finch or chestnut-eared finch (Taeniopygia castanotis)

The Australian zebra finch was described in 1837 by John Gould as Amadina castanotis, about 2 decades after the Sunda zebra finch (T. guttata) was described.For over a century and a half, both the Australian and Sunda zebra finches were classified as a single species, Taeniopygia guttata. However, they were split by the IUCN Red List and BirdLife International in 2016. The International Ornithological Congress followed suit in 2022 based on studies noting differences in plumage, mtDNA divergence, and assortative mating between both species in captivity.