I've never seen this before, and didn't know it could happen but it very much looked like this slimy critter was letting himself down by a slimey thread which was attached to the top of the greenhouse door frame, went from top to bottom ::) :o
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isn't that what they do when they're mating?
unless you have SAS slugs :D
;D all on its lonesome while I was watching!
don't think i'd be up for it either if someone was watching ;D
we had one hanging from the top of the plum tree ;D