Hi! if you looking for a hardier caterpillar try Samia cynthia or Samia ricini. they are very similar to bombyx mori but significantly hardier and slightly faster growing. The set up is the same as for horn/silkworms. They are prickly but the spines are soft like the horn on hornworms. They eat a warity of host plants but i wuld only use those that are raised on artifical diets or safe plants as as with hornworms. They eat silkworm and hornworm chow. Like hornworms they take some color from there food. Adults dont eat but can fly.