Which Old World locations are documented sites for accidental, vagrant transatlantic or trans-Pacific Willow Warbler sightings?
Answer
St. Lawrence Island and the Pribilofs
Although the Willow Warbler's main range is confined to the Old World, vagrancy occasionally draws individuals off course across the Atlantic or Bering Strait, leading to rare sightings in North America. The primary known locations where these accidental visitors are documented are situated in the Bering Sea region: specifically St. Lawrence Island and the Pribilofs. While records might exist elsewhere, these two locations are highlighted as the documented perimeters for these extreme migratory deviations.
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