Alien snails! Spotted in West Yorkshire.
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"Alien snails" because they are not native to this country but also rather apt as the shells have a distinct resemblance to the flying saucers of old American B-movie science fiction films!
Yes, they really do!
Judging by the NBN map link you're on the northern edge of the range at the moment (apart from one found in Glasgow).
Entomologist and biological recorder
Pretty much! Quite exciting really. There are loads of these snails at the site too.
Lat/Lng: 53.8, -1.8
OS grid ref: SE1639