Sonja

I have no idea if that wouuld be possible during migration that a bird would eat a snail far away and crap a long time later life eggs, but a healthy adult snail from a near- eastern or mediterran country or even nearer the Breisgau crawling for shelter into some outside stored wares on a pallet and surviving a truckride to some other wet enough place in the sticks here abouts would be likelier, you know, anything a greengrocer. builder or garden market would sell that is hauled around sans to much care and extra cooling. But if there is a population, it must be rather new. This huge eatable snail is not listed as a neozoe in the lake constance area.