I'm thinking these are rosy wolf snails - predator snails that eat other snails. Though they are also cannibalistic, hmm which is which they are doing here?

Maybe they will work on the slug population? But what's that little one to the side, A.S.I. snack?

I started collards again. (The slugs ate the first, I caught them in the act) This time when they are ready to be planted out, I think I'll make ring guards out of stair tread.

~dianne