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Breeding Range. (Fig. 134). Fairly common in the Pembina Hills, in the wooded deltaic sand area of western Pembina County, and in wooded valleys along the Red River and its tributaries (extending upstream along the Sheyenne River valley as far as Valley City); uncommon in the Turtle Mountains, in wooded valleys along the Mouse River (within McHenry County and southeastern Ward County), James River (between Jamestown and Grand Rapids), upper stretches of the Sheyenne River (between Valley City and Sheyenne), and in the wooded hills and lake shores of the Devils Lake area (within southern Ramsey County and eastern Benson County); rare and local elsewhere--recorded near Bismarck in Burleigh and Morton Counties and at Pleasant Lake in Benson County.

Breeding Habitat. Characteristic of rich, mesophytic types of mature deciduous forests that occur on river floodplains, and in sheltered ravines or on east- and north-facing slopes of river bluffs, escarpments, and morainic hills; also occurs occasionally in wooded residential areas of towns and cities. The habitat requirements of the Yellow-throated Vireo and Scarlet Tanager appear to be very similar.

Nesting. Probable breeding season: Late May to early August. In 1932, a nest in Fargo was situated in a tree about 10 feet above a much-used walk (Stevens 1950). A nest was found at Jamestown during June 1965 by Calvin Cink. An active nest was observed at Fargo from June 8 through July 8, 1974; one young bird was noted on edge of the nest on July 8 (E. G. Anderson). On August 4, 1966, two adults with one dependent young were observed near the Sheyenne River in Ransom County (P. F. Springer).

Figure 134. Breeding Range of Yellow-throated Vireo.