Harley’s scientific contributions

... A set of chapters about success in Australian threatened species conservation (Garnett et al. 2018b) also included 11 bird taxa as examples of preventing extinction or reducing its risk; however, not all of these examples showed a step change in conservation status: e.g. Helmeted Honeyeater Lichenostomus c. cassidix has also remained Critically Endangered for over three decades, but is likely to have gone Extinct without conservation interventions (Harley et al. 2018;Quin et al. 2021). Most recently, Woinarski et al. (2023b) listed eight bird taxa that had previously been listed as threatened under Australia's Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act) but no longer meet the listing criteria (while not necessarily being eligible for delisting; Woinarski et al. 2023a). ...

Reference:

Australian threatened birds for which the risk of extinction declined between 1990 and 2020