The Minnesota Biological Survey (MBS) has recorded 650 breeding season locations, many of which were found in the northeastern and north-central counties previously mentioned ( Minnesota Department of Natural Resources 2016). Janssen in 1987 and Hertzel and Janssen in 1998 updated confirmed nesting since 1970 to include eight new counties: Aitkin, Beltrami, Clearwater, Cook, Itasca, Lake, Marshall, and St. Several years later, Janssen ( 1987) slightly constricted the breeding range boundary in the southwestern portion to exclude Becker County and limit the boundary at Hubbard and Crow Wing Counties. The boundaries of their estimated breeding range extended west to eastern Becker and Mahnomen Counties, southwest to Cass, Crow Wing, and Wadena Counties, and south to northern Mille Lacs and Pine Counties. Inferred nesting was identified in Aitkin, Beltrami, Hubbard, Koochiching, Marshall, and Roseau Counties. They included confirmed nesting in Clearwater, Cook, Itasca, Lake, and St. One was even labeled “female with egg about ready to be laid,” presumably of a bird that was collected.įorty years later, Green and Janssen ( 1975) underscored the Yellow-rumped Warbler’s distribution as primarily in the northeastern and north-central regions of the state. All of these observations were made of fledged young, young with adults, or feeding young out of the nest.
He found it “not generally common as a breeding bird.” He reported very limited nesting activity, occurring primarily in regions of the state where he or many of his observers were located, including Itasca Park or in Marshall and St. Roberts ( 1932) stated the Yellow-rumped Warbler distribution was primarily north of Minnesota but that it was detected in the evergreen forests as far south as Cass Lake and west to eastern Marshall County.
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