. The Canadian field-naturalist. Natural history. 90 i The Canadian Field-Naturalist Vol. 116. 30 60 km Figure 4. Records of Northern Mockingbird occurrences in North Dakota during the twentieth century, by county. Asterisk (*) denotes counties where nests or dependent young have been observed. two references to mockingbirds nesting in North Dakota but without specific reference to date: A. C. Fox indicated that mockingbirds have been found nesting in Dickinson (Stark County; Stewart 1975), and R. L. Rytter noted adult mockingbirds feeding young in Kenmare (Ward County). Northern Mockingbirds
. The Canadian field-naturalist. Natural history. 90 i The Canadian Field-Naturalist Vol. 116. 30 60 km Figure 4. Records of Northern Mockingbird occurrences in North Dakota during the twentieth century, by county. Asterisk (*) denotes counties where nests or dependent young have been observed. two references to mockingbirds nesting in North Dakota but without specific reference to date: A. C. Fox indicated that mockingbirds have been found nesting in Dickinson (Stark County; Stewart 1975), and R. L. Rytter noted adult mockingbirds feeding young in Kenmare (Ward County). Northern Mockingbirds were observed in 36 () of the 53 counties in North Dakota (Figure 4, Appendix A). Although more mockingbird obser- vations occurred in the southern half than the north- ern half of North Dakota (Figure 4), the temporal pattern of expansion into North Dakota was sparse and sporadic rather than progressing from south to north (Appendix A). Counties with larger cities had more records of mockingbirds than less-populated counties. These included Bismarck in Burleigh County, Mandan in Morton County, Fargo in Cass County, Jamestown in Stutsman County, Minot in Ward County, Dickinson in Stark County, and Grand Forks in Grand Forks County. The largest number of records (n = 26) in a county occurred in Cass County, with most occurrences being from Fargo, the largest metropolitan area in North Dakota. The distribution of mockingbird records within the state also may reflect the distribution of observers in North Dakota. For example, there were seven records of mockingbirds in Adams County in south- western North Dakota, all made by C. Griffiths and/or D. Griffiths. The North American Breeding Bird Survey (BBS) is a program of standardized roadside surveys administered by the Geological Survey and conducted by experienced or knowledgeable volun- teers, usually in June. BBSs have been conducted in North Dakota since 1967; there are currently 44 active routes in the state. Norther
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