Animalia > Chordata > Aves > Galliformes > Phasianidae > Dendragapus > Dendragapus obscurus

Dendragapus obscurus (Blue Grouse)

Synonyms: Canace obscura; Dendrogapus obscurus; Tetrao obscurus (homotypic)

Wikipedia Abstract

The dusky grouse (Dendragapus obscurus) is a species of forest-dwelling grouse native to the Rocky Mountains in North America. It is closely related to the sooty grouse (Dendragapus fuliginosus), and the two were previously considered a single species, the blue grouse.
View Wikipedia Record: Dendragapus obscurus


EDGE Analysis

Uniqueness Scale: Similiar (0) 
 Unique (100)
Uniqueness & Vulnerability Scale: Similiar & Secure (0) 
 Unique & Vulnerable (100)
ED Score: 3.77781
EDGE Score: 1.56398


Adult Weight [1]  2.315 lbs (1.05 kg)
Birth Weight [3]  23 grams
Female Weight [1]  1.98 lbs (898 g)
Male Weight [1]  2.652 lbs (1.203 kg)
Weight Dimorphism [1]  34 %
Breeding Habitat [2]  Temperate western forests
Wintering Geography [2]  Non-migrartory
Wintering Habitat [2]  Temperate western forests
Diet [4]  Frugivore, Herbivore
Diet - Fruit [4]  20 %
Diet - Plants [4]  80 %
Forages - Ground [4]  100 %
Clutch Size [5]  7
Clutches / Year [3]  1
Fledging [1]  10 days
Global Population (2017 est.) [2]  300,000
Incubation [3]  26 days
Mating Display [6]  Ground display (mostly)
Mating System [6]  Promiscuity
Maximum Longevity [3]  14 years
Snout to Vent Length [1]  18 inches (46 cm)
Female Maturity [3]  1 year
Male Maturity [3]  1 year


Protected Areas

Biodiversity Hotspots

Name Location Endemic Species Website
California Floristic Province Mexico, United States No


Accipiter gentilis (Northern Goshawk)[7]


Parasitized by 
Ceratophyllus diffinis[8]
Chandlerella chitwoodae <Unverified Name>[9]
Molinacuaria bendelli <Unverified Name>[9]

Range Map

External References

NatureServe Explorer


Attributes / relations provided by
1Nathan P. Myhrvold, Elita Baldridge, Benjamin Chan, Dhileep Sivam, Daniel L. Freeman, and S. K. Morgan Ernest. 2015. An amniote life-history database to perform comparative analyses with birds, mammals, and reptiles. Ecology 96:3109
2Partners in Flight Avian Conservation Assessment Database, version 2017. Accessed on January 2018.
3de Magalhaes, J. P., and Costa, J. (2009) A database of vertebrate longevity records and their relation to other life-history traits. Journal of Evolutionary Biology 22(8):1770-1774
4Hamish Wilman, Jonathan Belmaker, Jennifer Simpson, Carolina de la Rosa, Marcelo M. Rivadeneira, and Walter Jetz. 2014. EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95:2027
5Jetz W, Sekercioglu CH, Böhning-Gaese K (2008) The Worldwide Variation in Avian Clutch Size across Species and Space PLoS Biol 6(12): e303. doi:10.1371/journal.pbio.0060303
6Terje Lislevand, Jordi Figuerola, and Tamás Székely. 2007. Avian body sizes in relation to fecundity, mating system, display behavior, and resource sharing. Ecology 88:1605
7Prey Abundance, Space Use, Demography, and Foraging Habitat of Northern Goshawks in Western Washington, Thomas David Bloxton, Jr., University of Washington 2002
8International Flea Database
9Gibson, D. I., Bray, R. A., & Harris, E. A. (Compilers) (2005). Host-Parasite Database of the Natural History Museum, London
Ecoregions provided by World Wide Fund For Nature (WWF). WildFinder: Online database of species distributions, ver. 01.06 Wildfinder Database
Biodiversity Hotspots provided by Critical Ecosystem Partnership Fund
Abstract provided by DBpedia licensed under a Creative Commons License
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset accessed via on 2023-06-13; License: CC BY 4.0