Fire-sensitive
Guides
Oeneis nevadensis
Great Arctic, Nevada Arctic, great grayling, Felder's Arctic, Pacific Arctic
Oeneis nevadensis, commonly called the great Arctic, is the largest western Arctic butterfly with a wingspan of 5.1–6.3 cm. It is distinguished by its biennial life cycle, with adults appearing only in even-numbered years for most populations. The species occurs in high-elevation habitats of the Cascade Mountains from southern British Columbia to northern California, where it represents the southernmost range limit for this Arctic group in western North America.