A few years ago I planted a flat of good-sized zinnias around the porch, plus here, there, and everywhere there seemed to be a space. Next day they were gone. Just nubs. Then I discovered a bumper crop of snails--big ones, lots of 'em--and they must have overwintered and woke up hungry. They weren't eating the daffodils or the yuccas --go figure--but they devoured the zinnias immediately.
Constant battle with my irrigation water. Too bad there's not a market for the snails in these parts. Oh well, the birds enjoy them--smashed and fried on rocks.