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Here is a link that might be useful: cocoon pics

You're in luck and have a bit of natural biological control a your place.

That's the cocoon of a cabbage looper that was parasitized by tiny critters by the name of Copidosoma. the parasitzed caterpillar always assumes an S-shape inside its filmy cocoon.

I often saw that when I lived in Long Beach, CA.

So leave it be so that it can carry on it's good works!

Wow, you are brilliant! Thanks for the info!