I never thought of this. I will have to set up a "sacrifice" garden for these guys so that we can witness the beautiful sphynx moths they produce. I didn't know the hornworm was the caterpillar these beauties come from.
I also like that they assist in end of season composting by digesting the overgrowth and dieing plants.
@psyonicphoenix will also appreciate this information.
The first time I saw one of these moths fluttering around my garden I was amazed! I just had to know where it came from. In my gardening past I have killed so many hornworms... but no more!