Dendragapus obscurus (Say, 1822)

Synonyms: Dendrogapus obscurus (Say, 1822)
Homonyms: Dendragapus obscurus (Say, 1822)
Common names: Blauw Sneeuwhoen in Dutch; Blue Grouse in English; Blue Grouse in English; Blue grouse in English; Blå Hjerpe in Danish; Blåjerpe in Norwegian; Douglasiengebirgshuhn in German; Dusky Grouse in English; Dusky Grouse in English; Dusky Grouse in English; Dusky Grouse in English; Dusky Grouse in English; Dusky Grouse in English; Dusky/Sooty Grouse in English; Felsengebirgshuhn in German; Gallo oscuro in Spanish; Gallo oscuro in Spanish; Gallo oscuro in Spanish; Pernice blu in Italian; Tétras sombre in French; Tétras sombre in French; Tétras sombre in French; blue grouse in language.; blue grouse in English; borowiak złotobrewy in Polish; dusky grouse in English; gråjärpe in Swedish; grèvol fosc in Catalan–Valencian; kupido bridlicový in Slovak; kék fajd in Hungarian; nulupüü in Estonian; pelēkais rubenis in Latvian; tamsusis tetervinas in Lithuanian; tetraz-azul in Portuguese; tetraz-azul in Portuguese; tetraz-azul in Portuguese; tetřívek douglaskový in Czech; tuhkapyy in Finnish; Голубой тетерев in Russian; アオライチョウ in Japanese; 蓝镰翅鸡 in Chinese; 藍鐮樹雞 in Chinese; Dusky Grouse in English; blåjerpe in Norwegian Bokmål

Banks, R. C., R. W. McDiarmid, and A. L. Gardner, 1987: Checklist of Vertebrates of the United States, the U.S. Territories, and Canada. Resource Publication, no. 166. 79.
Dickinson, E. C., and J. V. Remsen Jr., eds., 2013: null. The Howard and Moore Complete Checklist of the Birds of the World, 4th Edition, Vol. 1 Non-passerines. l + 461.
Dickinson, Edward C., ed., 2003: null. The Howard and Moore Complete Checklist of the Birds of the World, 3rd edition. 1039.
Gill, Frank, and Minturn Wright, 2006: null. Birds of the World: Recommended English Names. ix + 259.