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Breeding (green) and wintering (blue) distributions of the northern pintail. General migration routes (arrows) are shown for northern pintails that winter in Eastern Asia and Western North America based on banding and satellite telemetry studies (Bellrose 1980; Miyabayashi and Mundkur 1999; Miller et al. 2005; Nicolai et al. 2005). The geographic location of virus isolates (red dots) used in this study from Alaska and California are also shown.
