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Related to dusky grouse: blue grouse
A wildfowl (Dendragapus obscurus) of inland western North America, having predominantly gray-brown plumage. It was formerly considered a subspecies of the blue grouse.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.