Ruffed Grouse
Bonasa umbellus
Well-camouflaged chickenlike bird. Intricately patterned plumage varies from cold gray to rich reddish-brown. Look for relatively long, squared tail with dark band near the tip, bold barring on the sides, and small pointed crest. Typically shy and difficult to see well. Often flushed from the forest floor, exploding into the air with a startling burst of wingbeats and then gliding down towards the next hiding place. Sometimes ventures onto roadsides to pick up grit. In spring, males beat their wings to produce a distinctive low-pitched drumming sound. Widespread and locally fairly common across northern North America, from the Appalachians to Alaska. Especially fond of forested areas with dense understory and secondary growth.
Identification
Ruffed grouse are chunky, medium-sized birds that weigh from 450–750 g (0.99–1.65 lb), measure from 40 to 50 cm (16 to 20 in) in length and span 50–64 cm (20–25 in) across their short, strong wings. They have two distinct morphs: grey and brown. In the grey morph, the head, neck, and back are grey-brown; the breast is light with barring. There is much white on the underside and flanks. Overall, the birds have a variegated appearance; the throat is often distinctly lighter. The tail is essentially the same brownish grey, with regular barring and a broad black band near the end ("subterminal"). Brown-morph birds have tails of the same color and pattern. However, the rest of the plumage is much more brown, giving the appearance of a more uniform bird with less light plumage below and a conspicuously grey tail. There are all sorts of intergrades between the most typical morphs; warmer and more humid conditions favor browner birds in general.<p>The ruffs are on the sides of the neck in both sexes. They also have a crest on top of their head, which sometimes lies flat. Both sexes are similarly marked and sized, making them difficult to tell apart, even in hand. The female often has a broken subterminal tail band. At the same time, males tend to have unbroken tail bands, though the opposite of either can occur. Females may also do a display similar to the male. Another fairly accurate sign is that rump feathers with a single white dot indicate a female; rump feathers with more than one white dot indicate a male.<p>The average life span of a ruffed grouse is one year, although some birds are thought to live for as long as eleven years. Ruffed grouse are polygynous, and males may mate with several females during the breeding season.
Taxonomy
Bonasa umbellus was first described by Carl Linnaeus in his 1766 12th edition of Systema Naturae. He classified it as Tetrao umbellus, placing it in a subfamily with Eurasian grouse. The genus Bonasa was applied by British naturalist John Francis Stephens in 1819. Ruffed grouse is the preferred common name because it applies only to this species. Misleading vernacular names abound, however, and it is often called partridge (sometimes rendered pa'tridge, or shortened to pat), pheasant, or prairie chicken, all of which are properly applied to other birds. Other nicknames for ruffed grouse include drummer or thunder-chicken.<p>The ruffed grouse has 13 recognized subspecies:
- Scientific name
- Bonasa umbellus
- Authority
- (Linnaeus, 1766)
- Order
- Galliformes
- Family
- Phasianidae
- Genus
- Bonasa
Range and habitat
- Migration
- Resident species
Behavior
Migration pattern: Resident species.
Conservation
Population trend: stable.
- Population trend
- stable
Photos
Distribution
Bird Calls
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