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The Bufflehead Bucephala albeola breeds predominantly in Canada and Alaska (USA). Evidence suggests that the species may have recently expanded its breeding range southward into central and south central North Dakota. This paper presents data on observations of Buffleheads during the breeding season in Kidder County, North Dakota, 1994-2002, and discusses the possibility that the species has not expanded its breeding range but rather has established an extralimital post-breeding staging area south of its typical breeding range.
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A probable extralimital post-breeding assembly of Bufflehead Bucephala albeola in southcentral North Dakota, USA, 1994-2002