This is a fun activity for young and old alike. All you need is a caterpillar, a ventilated container, and the proper food for your caterpillar. If you are lucky, you will rear out a beautiful moth. Don't be too surprised or disappointed if you raise a fly or wasp instead. These parasites help keep moth populations from becoming too large. Use caution around spiny caterpillars; some can give you a painful poke. Check out these sites for more information on how to raise a caterpillar successfully.