Have you created many insect farms?

Thank you, guys. That clears things up a lot. Mantids love crickets, although I'm sure you know that much. So I guess I'll consider them as a possibility. I find it interesting that you can actually "slow down" types of worms. I bought a small book about how to care for a mantis, but I think if I can find a good e-book that will help. (I haven't found any proper paperbacks aside from the one I own on UK sites.)