I am curious about this as well. I've been trying to control a small population of pest snails (not sure what species) that I believe were introduced to my 10 gallon aquarium via driftwood.
Over the past month or so, I've noticed a few empty shells on sand, and I see my male half moon patrolling the bottom of the tank, observing closely as if he is hunting. I also caught him darting into a patch of grass and tossing a shell aside shortly after. I couldn't tell if the snail was alive before this, as I didn't see it.