. The Canadian field-naturalist. Natural history. 88 c o CO O 50 40- <D 30-1 20- E 10 0 The Canadian Field-Naturalist ^ Vol. 116 B Breeding Season I I Nonbreeding Season. 1901 1911 1921 1931 1941 1951 1961 1971 1981 1991 Decade Figure 1. Records of Northern Mockingbird occurrences in North Dakota during the eth century, by decade (, 1901 to 1910, 1991 to 2000). Dark = breeding records; light = nonbreeding-season records. twenti- -season summaries within figures represent the date that the individual record was first observed. For purposes of discussion, observations between 15 April and
. The Canadian field-naturalist. Natural history. 88 c o CO O 50 40- <D 30-1 20- E 10 0 The Canadian Field-Naturalist ^ Vol. 116 B Breeding Season I I Nonbreeding Season. 1901 1911 1921 1931 1941 1951 1961 1971 1981 1991 Decade Figure 1. Records of Northern Mockingbird occurrences in North Dakota during the eth century, by decade (, 1901 to 1910, 1991 to 2000). Dark = breeding records; light = nonbreeding-season records. twenti- -season summaries within figures represent the date that the individual record was first observed. For purposes of discussion, observations between 15 April and 31 August were considered breeding-season records, and observations between 1 September and 14 April were considered nonbreeding-season records (Derrickson and Breitwisch 1992). Results During the twentieth century, there were 128 reports of Northern Mockingbirds in North Dakota (Appendix A). The number of individuals detected during a single observation ranged from one to four. Most of the observations involved single birds observed for only one or a few Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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