Advertisement These are the 4 living snails (cellar snails) I found in my garage, among hundreds of empty snail shells. All these years some snails got trapped and reproduced due to dampness, but died quickly because of little to no food. These guys are laying eggs like crazy. They are mature and about the size of my thumbnail, but have since gotten bigger, and I found 2 more. I have let them go in a nice garden a few weeks ago. They were very interesting snails.