Posted by: Sandy Steinman | June 30, 2018

Tortoiseshell Butterfly Explosion

The Marin CNPS Facebook page reports there has been an explosion of Tortoiseshell Butterflies at Pt. Reyes. See photos at 

Large numbers were also reported at Mt. Umunum in San Jose and Lassen National Park.


  1. Same thing here in Central Oregon, at high elevations in the Cascades. Beginning around the 2nd of July.


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