Ceanothus Silkmoth Cocoon -- Hyalophora euryalus (kasloensis strain)
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This is the second largest silkmoth in the pacific northwest. Caterpillars get huge, feeding on a variety to broadleaf and conifer trees.
Adult moths do not feed. Instead they live off their built up energy reserves from the larval stage. Because of this, the moths only live about 7-10 days after hatching in spring.
More in depth instructions and discussion: