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1	Another Chicken Taxonomic revision of Blue Grouse Dendragapus obscurus now Dusky Grouse, re-elevating the previously recognized species Sooty Grouse Dendragapus fuliginosus (AOU 1931)
2	Taxonomic history Originally described 1873 as single species, Blue Grouse, with 8 subspecies in two groups “Dusky” (D. o. obscurus, D. o. richardsonii, D. o. oreinus and D. o. pallidus : Rocky Mountain and Great Basin ranges from Arizona and New Mexico north to Yukon and Northwest Territories). And “Sooty” D. o. fuliginosus, D. o. sierrae, D. o. sitkensis and D. o. howardi : Sierra Nevada, Cascade Mountains, and coastal ranges to southeast Alaska)
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