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Good question, Thomas (in Cincinnati, OH).
According to the May, 2010 issue of Birding Magazine, the Willow Warbler (ABOVE PHOTO) (Gambell, St. Lawrence Island, 8/25/02), Sedge Warbler (9/3/07) and Pallas’s Leaf Warbler (9/25/06) are the three most recent significant observations.
(By the way, a vagrant bird is one that appears far outside its normal range. Some people believe “accidental” equates with vagrancy. Among a number of factors that cause a bird to become vagrant, genetics and weather conditions are two.)
Which warblers are predicted as upcoming potential vagrants to Alaska?
Candidates include Gray’s Warbler, Oriental Reed-Warbler, Black-browed Warbler, Pale-legged Leaf Warbler, Radde’s Warbler, and Japanese Bush-Warbler.
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