Justification of Red List category
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (extent of occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
The global population size is unknown given recent taxonomic splits.
The population trend has not been investigated. Tree cover within the range is lost at a rate of 5% over ten years (Global Forest Watch 2021, using Hansen et al.  data and methods disclosed therein). Assuming that population declines are roughly equivalent to the rate of tree cover loss, they are here tentatively placed in the band 1-9% over ten years.
Text account compilers
Butchart, S., Ekstrom, J., Miller, E. & Taylor, J.
BirdLife International (2023) Species factsheet: Automolus virgatus. Downloaded from http://datazone.birdlife.org/species/factsheet/western-woodhaunter-automolus-virgatus on 04/10/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://datazone.birdlife.org on 04/10/2023.