The Australian ringneck (Barnardius zonarius) is a parrot native to Australia. Except for extreme tropical and highland areas, the species has adapted to all conditions. Treatments of genus Barnardius have previously recognised two species, the Port Lincoln parrot (Barnardius zonarius) and the mallee ringneck (Barnardius barnardi), but due to these readily interbreeding at the contact zone they are usually regarded as a single species B. zonarius with subspecific descriptions. Currently, four subspecies are recognised, each with a distinct range. The subspecies of the Australian ringneck differ considerably in colouration. It is a medium size species around 33 cm long. The basic colour is green, and all four subspecies have the characteristic yellow ring around the hindneck; wings and tail are a mixture of green and blue.