Boil them and throw them in alcohol.

Basically.

(I helped create a line-up of preserved caterpillars for the Lep Course in Arizona. You can see the bagworm (from this post) in the second dish)

I plan to write a few posts about raising and preserving caterpillars soon. I also have some really great “bad hair day” shots of my fuzzier caterpillars. Stay tuned!