The genus ''Dendragapus'' contains two closely related

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

of grouse that have often been treated as a single variable taxon (blue grouse). The two species are the

dusky grouse The dusky grouse (''Dendragapus obscurus'') is a species of forest-dwelling grouse native to the Rocky Mountains in North America.del Hoyo, J., Elliott, A., & Sargatal, J., eds. (1994). ''Handbook of the Birds of the World'' 2: 401–402. Lynx Ed ...

(''Dendragapus obscurus'') and the

sooty grouse The sooty grouse (''Dendragapus fuliginosus'') is a species of forest-dwelling grouse native to North America's Pacific Coast Ranges.del Hoyo, J., Elliott, A., & Sargatal, J., eds. (1994). ''Handbook of the Birds of the World'' 2: 401–402. Lynx ...

(''Dendragapus fuliginosus''). In addition, the spruce grouse and

Siberian grouse The Siberian grouse (''Falcipennis falcipennis''), also known as Siberian spruce grouse, Amur grouse, or Asian spruce grouse, is a short, rotund forest-dwelling grouse. A sedentary, non-migratory bird, it is the only member of the genus ''Falcipe ...

have been considered part of this genus. Dendragapus fuliginosus 5523

Description

These are large

grouse Grouse are a group of birds from the order (biology), order Galliformes, in the family (biology), family Phasianidae. Grouse are presently assigned to the Tribe (biology), tribe Tetraonini (formerly the subfamily Tetraoninae and the family Tetr ...

that inhabit highland regions of

North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...

and

Eurasia Eurasia ( , ) is a continental area on Earth, comprising all of Europe and Asia. According to some geographers, Physical geography, physiographically, Eurasia is a single supercontinent. The concept of Europe and Asia as distinct continents d ...

. The sooty grouse is found in the

Pacific Coast Ranges The Pacific Coast Ranges (officially gazetted as the Pacific Mountain System in the United States; ; ) are the series of mountain ranges that stretch along the West Coast of North America from Alaska south to Northern and Central Mexico. Althoug ...

and

Sierra Nevada The Sierra Nevada ( ) is a mountain range in the Western United States, between the Central Valley of California and the Great Basin. The vast majority of the range lies in the state of California, although the Carson Range spur lies primari ...

, and the dusky grouse in the

Rocky Mountains The Rocky Mountains, also known as the Rockies, are a major mountain range and the largest mountain system in North America. The Rocky Mountains stretch in great-circle distance, straight-line distance from the northernmost part of Western Can ...

. These two taxa were originally regarded as separate species, but were considered conspecific for much of the twentieth century. However, in 2006 the

American Ornithologists' Union The American Ornithological Society (AOS) is an ornithological organization based in the United States. The society was formed in October 2016 by the merger of the American Ornithologists' Union (AOU) and the Cooper Ornithological Society. Its ...

re-split them, following the DNA-based work of Barrowclough et al. (2004). whose results supported the earlier work of Brooks (1929) who regarded the two taxa as separate species based on morphology, behavior and vocalizations. The precise ranges of the two species are well-defined in the south, separated by extensive areas of unsuitable forest-free habitat, but somewhat uncertain in the north of the range of the genus where there is no separation; Barrowclough et al.'s study did not include these northern populations. Adults have a long square tail, gray at the end (lighter in the sooty grouse). Adult males are mainly dark (especially sooty grouse) with a yellow (sooty grouse) or purplish (dusky grouse) throat air sac surrounded by white, and a yellow (sooty grouse) or yellow-to-red (dusky grouse) wattle over the eye during

display Display may refer to: Technology * Display device, output device for presenting information, including: ** Electronic visual display, output device to present information for visual or tactile reception *** Cathode-ray tube (CRT), that uses an el ...

. Adult females of both species are mottled brown with dark brown and white marks on the underparts. Their breeding habitat is the edges of

conifer Conifers () are a group of conifer cone, cone-bearing Spermatophyte, seed plants, a subset of gymnosperms. Scientifically, they make up the phylum, division Pinophyta (), also known as Coniferophyta () or Coniferae. The division contains a sin ...

and mixed forests in mountainous regions of

and Eurasia. Their range is closely associated with that of various conifers. The nest is a scrape on the ground concealed under a shrub or log. All species have healthy populations, except for some population decline and habitat loss of the sooty grouse at the southern end of its range in southern California, and the Siberian grouse which is considered near-threatened.

Species

Extant Species

Fossils

Late Pleistocene The Late Pleistocene is an unofficial Age (geology), age in the international geologic timescale in chronostratigraphy, also known as the Upper Pleistocene from a Stratigraphy, stratigraphic perspective. It is intended to be the fourth division ...

fossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserve ...

species that have been described are ''Dendragapus gilli'' (western and west-central US), initially placed in a distinct genus ''Palaeotetrix'', and ''Dendragapus lucasi'' (known only from

Fossil Lake Fossil Butte National Monument is a United States National Monument managed by the National Park Service, located west of Kemmerer, Wyoming, United States. It centers on an assemblage of Eocene Epoch (56 to 34 million years ago) animal and pla ...

, US).

References

{{Taxonbar, from=Q903903 Bird genera Birds of North America