Allied Harrier (Circus assimilis) illustrated by Elizabeth Gould (1804–1841) for John Gould’s (1804-1881) Birds of Australia (1972 Edition, 8 volumes). Digitally enhanced from our own facsimile book (1972 Edition, 8 volumes).
Source: https://commons.wikimedia.org/wiki/File%3ABird_illustration_by_Elizabeth_Gould_for_Birds_of_Australia%2C_digitally_enhanced_from_rawpixel%2527s_own_facsimile_book26.jpg

The spotted harrier (Circus assimilis) also known as the smoke hawk, is a large Australasian bird of prey belonging to the family Accipitridae. The spotted harrier belongs to the family Accipitridae. Accipitridae is the largest family in the order Accipitriformes and encompasses many of the diurnal birds of prey including hawks and eagles. The spotted harrier is native to Australia and Indonesia, however vagrant populations have been seen in Timor-Leste. Spotted harriers can be seen throughout most of Australia's mainland, except in densely forested or woodland habitats of the coast, escarpments and ranges, and rarely in Tasmania.

Order: Accipitriformes
Family: Accipitridae
Genus: Circus
Species: Circus assimilis Jardine & Selby, 1828