Northern Prairie Wildlife Research Center
Breeding Range. (Fig. 164). Fairly common in the wooded valley along the Missouri River below Garrison Dam (extending downstream to a point about 10 miles below Bismarck), and in valleys along the lower portions of adjoining tributaries (including Knife River in Mercer County and Heart River in Morton and Grant Counties); uncommon along other portions of the Missouri River and major tributaries (including the Yellowstone, Little Missouri, and Cannonball rivers, Beaver Creek, and upper stretches of the Knife and Heart rivers) and in the Killdeer Mountains of northwestern Dunn County; rare along the Mouse River in Ward County.
Breeding Habitat. Semiopen, mesophytic, deciduous forest that occurs on slopes of prominent hills and escarpments and on well-drained floodplains of large streams. Prominent tree species in these habitats include American elm, green ash, bur oak, box elder, and cottonwood.
Nesting. Probable breeding season: Late May to late July. An active nest was found on June 23, 1921 in a grove of cottonwood near Medora in Billings County (Wood 1923). During July 16-30, 1913, a pair with young was seen several times in a box elder grove near Fort Clark in Oliver County (S. G. Jewett). On July 28, 1967, two families of flying young were recorded near Price in Oliver County (R. L. Kroodsma).
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Male Black-headed Grosbeak on nest. Burleigh County, June 1970 (photo by Ed Bry). |
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/birds/bbofnd/species/5960.htm
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Menlo Park, CA [caww54]
