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Arctic warbler (Phylloscopus borealis)
Along willow-lined streams in Alaska in summer, the song of the Arctic warbler is unmistakable: a slow trill, with an insistent or hammering sound. When the bird hops into view among the branches, it is less distinctive, plain olive and whitish with a pale eyebrow. In fall, the Arctic warbler crosses the Bering Strait and migrates south in Asia. |
