regardless of the whole which butterflies are safe thing, the problem with any kind of wild caught butterfly is that with all of the places they have been they are bound to have at least some pesticide residue(how could you visit hundreds of gardens and not pick up pesticide residue) if you want butterfly like feeders just raise silkies and feed some of the moths or you could let a couple of hornworms go to moth stage if your cham is big enough to handle them, at least then you are assured of the wholesomeness of your feeders