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This species almost exclusively flies in even-numbered years, with scattered records in odd-numbered years, and a few local populations that only fly in odd-numbered years. Wingspan: 50 to 67 mm
Spotted along the Union creek trail in the Cascade mountains. Above 2500 ft. The great Arctic is found almost exclusively in the Cascade Mountains, from southern British Columbia to northern California. The great Arctic is found from sea level to 7,000 feet (2,100 m). Habitats include forest clearings, open pinewoods, gravel roads, meadows, slopes, and canyons. Along the coast, it is commonly found on bare mountain summits.
Adult food source: various flowers including yarrow, mallow ninebark and composites.
Spotted on Jun 24, 2018
Submitted on Nov 4, 2018