@casheroo That red liquid isn’t blood, it’s extra fluid that builds up in the butterfly’s body, and has to be expelled after emerging from the chrysalis. However, they do poop a lot and it is disgusting. The painted lady caterpillars advertised on TV aren’t nearly as disgusting as the tobacco hornworm caterpillars we once raised. They turn into these very cool moths that fly and hover like hummingbirds. The company accidentally sent us way too many caterpillars, which grew to be four inches long and pooped like maniacs. So gross.
Anyway, we ordered that butterfly kit once and my kids really enjoyed it. Every caterpillar eventually turned into a butterfly, and in spite of the pooping they were easy to take care of. The kids had a lot of fun, and it’s even nice to let them go and see them flutter away. The caterpillars are raised in a sterile environment and have no risk of exposing wild butterflies to disease. That particular type of butterfly is also widespread, so not an invasive species. Unlike the tobacco hornworms we raised, which are tomato pests. We couldn’t release the moths, but had to let them live out their two week life span.
Since we now have the mesh butterfly habitat, we don’t bother with ordering the caterpillars again. We find them, collect leaves from the plant we find them on, and raise them. The mesh container is also good for observing a praying mantis for a couple of days, or safely housing a butterfly you catch and want to look at for a while.
If you want to raise caterpillars, really all you need are some plastic cups and coffee filters. Put a caterpillar in the cup, secure the coffee filter over the top with a rubber band, and give it a fresh supply of leaves each day. When the caterpillar is ready to form a chrysalis, it will hang from the coffee filter and do its thing. If the cup is big enough for a butterfly to spread its wings, you can leave it there. If not, remove the coffee filter and pin it to the lid of a larger container (like the mesh butterfly house!). The caterpillars will still poop a lot, but since their food is leaves, not a mushy artificial diet, the poop is dry and much easier to dump out of the container.
Another fun insect project is to order a praying mantis egg case. Each egg case produces over a hundred tiny mantids, each about the size of a mosquito. We let them go in our garden so they can eat all the pests. It’s crazy to see all the little buggers crawling out of that egg case though. They are also pretty cheap, only a few bucks, and you can order them from a lot of organic garden supply sites.