Butterfly gardener extraordinaire Connie Day gave us two caterpillars from her garden, which is a certified Monarch Waystation.
We reared them inside (mostly) on a milkweed plant, which provided all they required, except water drops. We placed the plant inside one of those netted cages you use to raise painted ladies.
Some articles I reported recently afforded me the opportunity to engage Brent "the bug guy" Karner of the LA County Natural History Museum in an extended conversation about butterflies. A portion of the discussion was broadcast last weekend on KPCC's Off-Ramp. Check it out.