Northern Prairie Wildlife Research Center
Breeding Range. (Fig. 126). Common in the Turtle Mountains, in the Agassiz Lake Plain Region, and on the Southern Drift Plain and Coteau Slope; fairly common (locally common) on the Northeastern and Northwestern Drift Plains and on the Little Missouri Slope; uncommon (fairly common locally) on the Missouri Coteau and Missouri Slope.
Breeding Habitat. Tracts of woodland with partially open tree canopy located in areas that are grazed represent the principal natural habitats occupied by breeding pairs. Robins also have been very successful in adapting to certain types of habitat created by man. Open tree growth and tall shrubs interspersed with mowed or grazed grassland (lawns, pastures, etc.) appear to represent the optimum combination of habitat factors. These situations occur commonly in residential areas and parks of towns and cities and on farmsteads. Shelterbelts that are adjacent to mowed or grazed grassland are also utilized to some extent.
Nesting. Breeding season: Mid-April to mid-August; peak, late April to late July. Nest-building was recorded as early as April 15 [1969] in Stutsman County (P. F. Springer). Extreme egg dates (14 nests): April 23 [1973] in LaMoure County (M. L. Avery) to June 30 [1915] in Grand Forks County (R. Kellogg). Extreme nestling dates (9 nests): May 8 [1973] in LaMoure County (M. L. Avery) to July 15 [1972] in Billings County (E. A. Swenson). Extreme dates for dependent young out of the nest (31 records): May 28 [1963] to August 12 [1961] in Stutsman County (RES).
Nests were usually situated in crotches or on limbs of trees and tall shrubs. Occasionally, eaves and various supporting structures of buildings were utilized as nest sites. Most nests were placed at elevations of 5 to 15 feet above the ground.
Indicated clutch size (8 nests): 3 to 5 eggs; mean, 3.9 eggs.
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| Figure 126. Breeding Range of American Robin. |
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U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/birds/bbofnd/species/7610.htm
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Menlo Park, CA [caww54]
