Plettet Voldsnegl (dk)Caracol Común de Jardín (es)
Introduced around 1880 to Copenhagen, from the Mediterranean region, and during the last decades starting to spread its distribution throughout the country.
Looks like the Roman Snail (Vinbjergsnegl), but is smaller and the shell has a pronounced reticulated and marbled pattern that is not seen on the ROSN.
Other names: Helix aspersa
554 (1 photos) 2021-05-28 Amager Fælled, Denmark
Officially my first observation of the species, but mostly because I haven't been aware of its existence before.