I never knew it but there are companies that raise bugs for schools and research facilities.
My neighbor and client is one of those people.
A couple of weeks ago he gave me a few caterpillars along with the forgoer food.
They were for my 6 year old grand daughter.
Well, they ate for a week soon spun their crystallize and then emerged a butterfly after another week.
What a great hands-on learning experience for young kids