• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

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). The population trend is precautionarily assessed as stable, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is very large, and hence does not 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.

Population justification
The global population is estimated to number 200,000 mature individuals (Partners in Flight 2020).

Trend justification
Based on data from the North American Breeding Bird Survey, over the past three generations (13.8 years) the species has undergone a non-significant annual increase of 1.48% (4.25% decrease to 6.26% increase) (Pardieck et al. 2018). This corresponds with Partners in Flight's assessment of the species, which implies the species's trend is stable or increasing slowly (Partners in Flight 2020). Data from Audubon's Christmas Bird Count however suggest a long-term decline of the population (Meehan et al. 2018). Given the uncertainty over whether the species is increasing, it is precautionarily assessed here as stable.

This species has a large range, which spreads from northern Canada to California across the internal western United States and Canada.

The species occurs in a variety of pine and fir forest habitats from sea level to 3,600 m close to the tree line.

Text account compilers
Hermes, C.

Contributors
Bird, J., Butchart, S. & Westrip, J.R.S.

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Recommended citation
BirdLife International (2024) Species factsheet: Dusky Grouse Dendragapus obscurus. Downloaded from https://datazone.birdlife.org/species/factsheet/dusky-grouse-dendragapus-obscurus on 19/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 19/12/2024.