Four years of targeted surveys across northern Queensland failed to detect any evidence of Buff-breasted Button-quail Turnix olivii.

It is nearly a century since the Buff-breasted Button-quail Turnix olivii was last definitively recorded, resulting in the species being recently classified as one of Australia's most imperilled species. However, conservation action to recover the species has been hampered by an inability to locate an extant population. To overcome this problem we conducted extensive surveys across the species' presumed distribution. We surveyed historical sites where the species was collected, and also where habitat deemed suitable for the species occurred on Cape York Peninsula. We also surveyed sites on the northern Atherton Tablelands where a contemporary population has been reported. Surveys were conducted from 2018 to 2022 and employed a variety of survey methods known to be suitable for detecting button-quail. No evidence of Buff-breasted Button-quail was detected. However, Painted Button-quail Turnix varius where found to be widespread at sites surveyed in the Wet Tropics and Einasleigh Uplands bioregions as well as in southern areas of Cape York Peninsula. We discuss the implications of these results including the likely effectiveness of the different survey methods for detecting the Buff-breasted Button-quail specifically, and button-quail generally. [ABSTRACT FROM AUTHOR]