The snails can't say they weren't warned. After tolerating their incursions into the garden of the 29th Dimension, and disposing of apprehended transgressors in a thoughtful and organic way, we determined that helix pomatia had crawled beyond the pale. Following extended rainfall, hordes of the blighters appeared and made free with the vegetation. Extreme measures were agreed upon and outright chemical warfare was thus declared and WMD were deployed.
This did the trick and mass slaughter of snails and their loathsome cousins, the slugs, has ensued. Some of the remains have been gathered up - what you see here is perhaps only a third of the victims claimedt. Slugs, of course, leave only a mess of slime.