a. monarchoides The regent parrot or rock pebbler (Polytelis anthopeplus) is a bird found in southern Australia.

[2] A 2017 molecular study placed the regent parrot as an early offshoot to the genus Aprosmictus and not as closely related to the other two species.

Lear included two images in Illustrations of the family of Psittacidae, or parrots, an early folio of lithographs with brief captions.

The regional origin of the parrots, presented as two species, is not supplied in the work, so the type specimen or locality for each was not formally nominated and assumed to be lost.

A 1912 review by G. M. Mathews stated the source of the specimens was New South Wales, and occurred in a range that excluded the Southwest of the country.

When correcting this omission, Mathews proposed the taxa named anthopeplus and melanura in Lear's folio was only found in the east and that the southwest population was a new taxon, nominated westralis.

The arrangement and typification of the geographically separate groups was largely ignored by authors, until Richard Schodde published a conclusion that the origin of both Lear's specimens were from a Western Australian population, based on differences in colouration of the female plumage which he observed in the plates.

[8] The indigenous names for the southwest subspecies in the Nyungar language, noted by Dom Serventy, include Waukanga and Wouk-un-ga, and Walkinger recorded at Avon River.

[12] The western subspecies has adapted to feed on fruits and wheat, or other cereals, introduced throughout the range after European settlement of the region.

[12][2] Nesting is at the base of a tree hollow of great depth, up to fifteen feet within the main stem of the plant.

[9] The site is usually a large eucalyptus, with a hollow in the trunk that may reach almost to ground level, where the female lays around four eggs.