Family: Turdidae (Thrushes)
Authority: (Wilson, 1891)
Red List Category
for more information about the Red List categories and criteria
Justification of Red List category
The last confirmed sighting of this species was in 1980 (Pyle and Pyle 2017), with unconfirmed reports in 1988, 1994 and 2005, and no subsequent records despite further surveys in most of the historical range in Kamako'u-Pelekunu. It may have been driven extinct by diseases spread by introduced mosquitoes and habitat destruction. A set of papers published in 2017 (Akcakaya et al
. 2017, Keith et al
. 2017, Thompson et al
. 2017) laid out methods for quantitatively estimating a species’s probability of extinction based on parameters associated with threats, in addition to records and surveys. Based on the application of these methods (Butchart et al.
2018), this species would qualify for reclassification as Critically Endangered. However, the authors recommended retaining it as Critically Endangered (Possibly Extinct)
because the final site for the species (the Olokui natural area reserve) is only 6.6 km2
, less than half of which is suitable habitat, and it has been isolated for so long that it is highly unlikely that any population has persisted.
Land-mass type - oceanic island
Realm - Oceanic
IUCN Ecosystem -- Terrestrial biome