https://www.audubon.org/field-guide/bird/dusky-grouse

Until recently, this and the Sooty Grouse were considered to make up one species under the name Blue Grouse. Slow-moving and inconspicuous, but often  ...

https://nhpbs.org/natureworks/bluegrouse.htm

The blue grouse is 15 to 21 inches in length. The male blue grouse is gray to bluish-gray with a red to yellow-orange comb over its eyes. It has a yellow neck sac ...

https://en.wikipedia.org/wiki/Dendragapus

The genus Dendragapus contains two closely related species of grouse that have often been treated as a single variable taxon (blue grouse). The two species ...

https://en.wikipedia.org/wiki/Dusky_grouse

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.

https://www.allaboutbirds.org/guide/Dusky_Grouse/overview

This large grouse lives in mountain forests of ponderosa and lodgepole pine, aspen, and fir. Males are steely gray-blue with purplish air sacs in the neck and red ...

https://www.allaboutbirds.org/guide/Dusky_Grouse/id

This large grouse lives in mountain forests of ponderosa and lodgepole pine, aspen, and fir. Males are steely gray-blue with purplish air sacs in the neck and red ...

http://www.biokids.umich.edu/critters/Dendragapus_obscurus/

What do they look like? Dusky grouse are the second largest grouse species in North America, the only species that is larger are sage grouse. Dusky grouse are  ...

https://projectupland.com/upland-game-birds/blue-grouse-2/

Apr 7, 2018 ... Read about the splitting of the blue grouse species into the sooty grouse and dusky grouse as well as how to identify them and where they ...

http://www.lewis-clark.org/article/2187

While Clark and the main party worked their way up Jefferson's River on August 1 , 1805, through what appeared to be another "gate" of the Rocky Mountains, ...

https://animaldiversity.org/accounts/Dendragapus_obscurus/

Dendragapus obscurusblue grouse ... Dusky grouse (Dendragapus obscurus) have a very large geographic range, extending from the Northwest Territories in ...