Tag Archives: California tortoiseshell

Migrating Tortoiseshells

In August while climbing Mount Lassen (Lassen Volcanic National Park CA) Leonard and I were surrounded by literally thousands of California tortoiseshells (Nymphalis californica). The butterflies were hitting us, landing on us, covering the snow and talusĀ  and filling the … Continue reading

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California Tortoiseshell

This gallery contains 2 photos.

California tortoiseshells (Nymphalis californica) are found in the conifer forests of Western North America. These butterflies overwinter as adults. In the northern, colder parts of their range the adults emerge in late May or June and have only one generation. … Continue reading

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