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What other caterpillars will eat milkweed?

I found a slender green caterpillar eating my milkweed. It spins a silk house around itself, then comes out to feed, then goes back in whan alarmed or annoyed. Any ideas here? Thanks!

One good starting place on the web.
You can check the HOSTS database, which links caterpillars and hostplants. Type in your locality, plant family (Aesclepidaceae?), and it will list the caterpillars that have been reported on milkweed.

I'm unable to come up with anything other than Monarch, Soldier & Queen that eat the milkweed. I'll try to get a picture tomorrow. Thanks!

There's more than that
Putting Asclepias for the host genus, as in this link turns up several species of moths, in addition to the butterflies you mentioned.

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