Polyphemus Silkmoth Cocoon -- Antheraea polyphemus
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This is the largest silkmoth in the pacific northwest. Caterpillars get huge, feeding on a variety to broadleaf 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: