The Hybred Red Wigglers have 7 hearts...........never researched the African Night Crawlers or any of the others for that matter.
Would you believe there was a very huge market at one time for the HRW's in Japan. Protein. And, they were also used by land
fills to eat refuse and leave castings (fertilizer) which was later harvested and sold to nurserys. Back in the 70's, a lot of folks
that lived on dairies were in the commercial worm business, at least in my neck of the woods. Some folks made some money just
raising worms. Thought I'd share that just for educational purposes.