Description: English: Yellow-rumped Thornbill (bottom), Acanthiza chrysorrhoa, Yellow Thornbill (up), Acanthiza nana illustration of 1911 book The birds of Australia. Date: 20 September 2015. Source: The birds of Australia, 1911
https://www.biodiversitylibrary.org/page/37362546#page/335/mode/1up. Author: undefined "A. J. North", probably Alfred John North (1855-1917), author of Nests and eggs of birds found breeding in Australia and Tasmania.