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Dusky Grouse - Dendragapus obscurus
Other Names:  Blue Grouse

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Global Rank: G5
State Rank: S4

Agency Status
USFWS:
USFS:
BLM:
FWP Conservation Tier: 2
PIF: 3


 

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Copyright by: The Macaulay Library at the Cornell Lab of Ornithology, Ithaca, NY, all rights reserved.
 
General Description
The Dusky Grouse (until recently known as the Blue Grouse) is the largest of Montana's three species of mountain grouse. Both sexes have long, square tails which are unbarred. Males have slate-colored upper parts, white-based neck feathers around the air sacs, and yellow-orange eye combs. Females tend to be browner than males and have barring on the head, neck, and back. Both sexes have uniform blue-gray breasts and bellies, and feathered legs. Adult males range from 18.5 to 22.5 inches in length and 2.5 to 3 pounds in weight; adult females range from 17 to 19 inches in length and average about 2 pounds in weight.

Diagnostic Characteristics
Dusky Grouse are most likely to be confused with Spruce (Franklin) Grouse in Montana. Male Spruce Grouse, however, are considerably smaller than male Dusky Grouse and have a black breast patch. Female Spruce Grouse have white under parts with conspicuous black barring, while female Dusky Grouse are bluish-gray beneath.

Species Range
Montana Range

Click the legend blocks above to view individual ranges.

Montana Distribution


Western Hemisphere Range

 


Summary of Observations Submitted for Montana
Number of Observations: 979

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

Breeding
(direct evidence "B")


Breeding
(indirect evidence "b")


No evidence of Breeding
(transient "t")


Overwintering
(regular observations "W")


Overwintering
(at least one obs. "w")



 

(Records associated with a range of dates are excluded from time charts)



Habitat
Dusky Grouse winter at high elevations in conifer stands. In early spring, they descend to lower altitudes, where they prefer forest edges and openings. Broods may be found quite far from timber during summer and early fall. In the Bridger Mountains in early summer, broods were often observed in grass-forb areas (with arrow-leaf balsamroot being dominant); increased use of deciduous thickets was observed in late July to August (Mussehl 1958). See also Martinka 1970 for habitat comments from the Sapphire Mountains.

Ecological Systems Associated with this Species
  • Details on Creation and Suggested Uses and Limitations
    How Associations Were Made
    We associated the use and habitat quality (high, medium, or low) of each of the 82 ecological systems mapped in Montana for vertebrate animal species that regularly breed, overwinter, or migrate through the state by:
    1. Using personal observations and reviewing literature that summarize the breeding, overwintering, or migratory habitat requirements of each species (Dobkin 1992, Hart et al. 1998, Hutto and Young 1999, Maxell 2000, Foresman 2001, Adams 2003, and Werner et al. 2004);
    2. Evaluating structural characteristics and distribution of each ecological system relative to the species’ range and habitat requirements;
    3. Examining the observation records for each species in the state-wide point database associated with each ecological system;
    4. Calculating the percentage of observations associated with each ecological system relative to the percent of Montana covered by each ecological system to get a measure of “observations versus availability of habitat”.
    Species that breed in Montana were only evaluated for breeding habitat use, species that only overwinter in Montana were only evaluated for overwintering habitat use, and species that only migrate through Montana were only evaluated for migratory habitat use.  In general, species were associated as using an ecological system if structural characteristics of used habitat documented in the literature were present in the ecological system or large numbers of point observations were associated with the ecological system.  However, species were not associated with an ecological system if there was no support in the literature for use of structural characteristics in an ecological system, even if point observations were associated with that system.  High, medium, and low habitat quality was assigned based on the degree to which the structural characteristics of an ecological system matched the preferred structural habitat characteristics for each species in the literature.  The percentage of observations associated with each ecological system relative to the percent of Montana covered by each ecological system was also used to guide assignments of habitat quality.  If you have any questions or comments on species associations with ecological systems, please contact Bryce Maxell at bmaxell@mt.gov or (406) 444-3655.

    Suggested Uses and Limitations
    Species associations with ecological systems should be used to generate potential lists of species that may occupy broader landscapes for the purposes of landscape-level planning.  These potential lists of species should not be used in place of documented occurrences of species (this information can be requested at: http://mtnhp.org/requests/default.asp) or systematic surveys for species and evaluations of habitat at a local site level by trained biologists.  Users of this information should be aware that the land cover data used to generate species associations is based on imagery from the late 1990s and early 2000s and was only intended to be used at broader landscape scales.  Land cover mapping accuracy is particularly problematic when the systems occur as small patches or where the land cover types have been altered over the past decade.  Thus, particular caution should be used when using the associations in assessments of smaller areas (e.g., evaluations of public land survey sections).  Finally, although a species may be associated with a particular ecological system within its known geographic range, portions of that ecological system may occur outside of the species’ known geographic range.

    Literature Cited
    • Adams, R.A.  2003.  Bats of the Rocky Mountain West; natural history, ecology, and conservation.  Boulder, CO: University Press of Colorado.  289 p.
    • Dobkin, D. S.  1992.  Neotropical migrant land birds in the Northern Rockies and Great Plains. USDA Forest Service, Northern Region. Publication No. R1-93-34.  Missoula, MT.
    • Foresman, K.R.  2001.  The wild mammals of Montana.  Special Publication No. 12.  Lawrence, KS: The American Society of Mammalogists.  278 p.
    • Hart, M.M., W.A. Williams, P.C. Thornton, K.P. McLaughlin, C.M. Tobalske, B.A. Maxell, D.P. Hendricks, C.R. Peterson, and R.L. Redmond. 1998.  Montana atlas of terrestrial vertebrates.  Montana Cooperative Wildlife Research Unit, University of Montana, Missoula, MT.  1302 p.
    • Hutto, R.L. and J.S. Young.  1999.  Habitat relationships of landbirds in the Northern Region, USDA Forest Service, Rocky Mountain Research Station RMRS-GTR-32.  72 p.
    • Maxell, B.A.  2000.  Management of Montana’s amphibians: a review of factors that may present a risk to population viability and accounts on the identification, distribution, taxonomy, habitat use, natural history, and the status and conservation of individual species.  Report to U.S. Forest Service Region 1.  Missoula, MT: Wildlife Biology Program, University of Montana.  161 p.
    • Werner, J.K., B.A. Maxell, P. Hendricks, and D. Flath.  2004.  Amphibians and reptiles of Montana.  Missoula, MT: Mountain Press Publishing Company. 262 p.

Food Habits
In winter they eat mainly conifer needles. In summer they eat a mixed diet of insects, green plants and berries. The young eat mainly insects (Mussehl 1971).

Ecology
Brood movement in summer is generally less than 0.5 mile. Brood break-up appeared concurrent with fall dispersal, in late August to early September and had lateral and altitudinal components. Brood range densities were 27 (1957) and 34 (1958) in a 1 square mile area (Mussehl 1958).

Reproductive Characteristics
Hatching dates in the Bridger Mountains ranged from May 25 to July 11, with the peak the 3rd week of June (Mussehl 1958). Near Fortine, hatching dates were June 10 to August 15; broods ranged from 1 to 10 young.

References
  • Additional ReferencesLegend:   View WorldCat Record   View Online Publication
    Do you know of a citation we're missing?
    • Aldrich, J. W. 1963. Geographic Distribution of American Tetraonidae. J. Wildl. Manage. 27:529-545.
    • American Ornithologists' Union. 1998. Check-list of North American birds. 7th edition. American Ornithologists' Union, Washington, D.C. 829 pp.
    • Anonymous. 1959. Blue grouse. Montana Wildlife. November.
    • Blackford, J. L. 1958. Territoriality and breeding behavior of a population of blue grouse in Montana. The Condor 60:145-158.
    • Blackford, J.L. 1963. Further observations on the breeding behavior of a blue grouse population in Montana. Condor 65:485-513.
    • Casey, D. 2000. Partners in Flight Draft Bird Conservation Plan Montana. Version 1.0. 287 pp.
    • Ehrlich, P., D. Dobkin, and D. Wheye. 1988. The birder’s handbook: a field guide to the natural history of North American birds. Simon and Schuster Inc. New York. 785 pp.
    • Hartkom, F. L. 1956. Montana blue grouse. Montana Wildlife. June.
    • Herman, M. F. 1980. Spruce grouse habitat requirements in western Montana. Ph.D Thesis. Univ. of Montana, Missoula. 181 pp.
    • Hutto, R. L. and J. S. Young. 1999. Habitat relationships of landbirds in the Northern Region, USDA Forest Service. General Technical Report RMRS-GTR-32. U. S. Department of Agriculture, Forest Service, and Rocky Mountain Research Station, Ogden, UT. 72 pp.
    • Johnsgard, P. A. 1973. Grouse and quail of North America. U. of Nebraska, Lincoln. 553 pp.
    • Johnsgard, P. A. 1992. Birds of the Rocky Mountains with particular reference to national parks in the northern Rocky Mountain region. Lincoln: University of Nebraska Press. xi + 504 pp.
    • Landusky Mining Inc., Zortman, MT. Assisted by Hydrometrics, Helena, MT., 1985, Operating Permit Application for an Extension of Landusky Mining Incorporated Operations, Phillips County, Montana. June 12, 1985
    • Lenard, S., J. Carlson, J. Ellis, C. Jones, and C. Tilly. 2003. P. D. Skaar's Montana Bird Distribution, 6th Edition. Montana Audubon: Helena, MT, 144 pp.
    • Marshall, W. H. 1946. Cover preferences, seasonal movements, and food habits of Richardson's grouse and ruffed grouse in Southern Idaho. Wilson Bull. 58:42-52.
    • Martinka, R. R. 1970. Structural characteristics and ecological relationships of male blue grouse (DENDRAGAPUS OBSCURUS (Say)) territories in southwestern Montana. Ph.D Thesis. Montana State University, Bozeman. 73 pp.
    • Montana Bird Distribution Committee. 2012. P.D. Skaar's Montana bird distribution. 7th Edition. Montana Audubon, Helena, Montana. 208 pp. + foldout map.
    • Montana Dept. of State Lands, 1978, Preliminary environmental review for the proposed granting of an underground mining permit to Beartooth Coal Company, Incorporated, for the reopening of an underground coal mine in the area of Bearcreek, Carbon County, Montana. July 10, 1978.
    • Mussehl, T. W. 1958. Blue grouse production, movements, and populations in the Bridger Mountains, Montana. M.S. thesis. Montana State University, Bozeman. 34 pp.
    • Mussehl, T. W. 1961. Blue grouse population study. Montana Dept. of Fish and Game, Helena. 13 pp.
    • Mussehl, T. W. 1962. Blue grouse population study. Montana Dept. of Fish and Game, Helena. 17 pp.
    • Mussehl, T. W. 1962. Effects of land-use practices on blue grouse habitat (breeding areas). Montana Dept. of Fish and Game, Helena. 5 pp.
    • Mussehl, T. W. 1962. Some physical characteristics of ground vegetation used by blue grouse broods. NW Sec., The WildI. Soc., Missoula. 11 pp.
    • Mussehl, T. W. 1963. Blue grouse brood cover selection and land-use implications. J. Wildl. Mgmt. 27(4):546-555.
    • Mussehl, T. W. 1965. Blue grouse population study (side effects of insecticides used in spruce budworm control). Montana Dept. of Fish and Game, Helena. 41 pp.
    • Mussehl, T. W., and T. H. Leik. 1963. Sexing wings of adult blue grouse. J. WildI. Manage. 27: 102-106.
    • Mussehl, T.W. P. Schladweiler, and R. Weckwerth. 1971. Forest Grouse. pp. 142-152 in T.W. Mussehl and F.W. Howell (eds.), Game Manaqement in Montana. Montana Department of Fish and Game, Helena. 238 pp.
    • Rogers, G. E. 1963. Blue grouse census and harvest in the United States and Canada. J. WildI. Manage. 27:579-585.
    • Schladweiler, P. 1968. Blue grouse population and life history study. Montana Dept. of Fish and Game. Job Compi. Rep., Proj. No. W-91-R-9, Job No.II-C. 12 pp.
    • Schladweiler, P. 1975. Seasonal food habits of Montana blue grouse. State of MT, Proj. No. W-120-R-6.
    • Schladweiler, P. and T. W. Mussehl. 1969. Use of mist-nets for recapturing radio-equipped blue grouse. Joural of Wildlife Management 33(2):443-444.
    • Schladweiler, P., T. W. Mussehl and R. J. Greene. 1970. Age determination of juvenile blue grouse by primary development. Journal of Wildlife Management 34(3):649-652.
    • Skinner, M. P. 1927. Richardson's grouse in Yellowstone National Park. Wilson's Bull. 39:208-214.
    • Stabler, R. M., N. J. Kitzmiller, G. M. Clark, T. W. Mussehl and P. Schladweiler. 1969. HEMATOZOA from Mountain blue grouse. Jour. Parasit. 55(4):830-832.
    • Stearns-Roger Inc., 1975, Environmental baseline information of the Mount Vernon Region, Montana. January 31, 1975.
    • TVX Mineral Hill Mine, Amerikanuak, Inc., Gardiner, MT., 2002, Yearly summary of wildlife observation reports. 1990-2002 Letter reports.
    • U.S. Forest Service. 1991. Forest and rangeland birds of the United States: Natural history and habitat use. U.S. Department of Agriculture, Forest Service Agricultural Handbook 688. 625 pages.
    • USDI Fish and Wildlife Service., 1961, A Detailed report on fish and wildlife resources affected by McNamara Dam and Reservoir, Blackfoot River Project, Montana. June 1961.
    • Walcheck, Kenneth C., 1999, The Lewis & Clark Expedition: Montana's first bird inventory through the eyes of Lewis and Clark.
    • Zackheim, Karen, 1973?, Exhibit H: Wildlife Study. In Ash Grove Cement Co. files.
    • Zwickel, Fred C., and James F. Bendell. 2005. Dusky Grouse (Dendragapus obscurus). Species Account Number 015. The Birds of North America Online (A. Poole, Ed.). Ithaca, NY: Cornell Laboratory of Ornithology; Retrieved 3/25/2008 from The Birds of North America Online database
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Citation for data on this website:
Dusky Grouse — Dendragapus obscurus.  Montana Field Guide.  Montana Natural Heritage Program and Montana Fish, Wildlife and Parks.  Retrieved on October 31, 2014, from http://FieldGuide.mt.gov/speciesDetail.aspx?elcode=ABNLC09020
 
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