Early this morning I saw two Arion sp. slugs in convoy making their way across a path
The slugs weren’t in the process of copulation, which happens much farther up the body and involves a lot of mucus from what I’ve seen (!), so I was curious to know what was going on (and a bit suspicious because I don’t think I trust Arions to behave nicely). I pulled them apart and found, horrifyingly enough, that the rear slug had been chowing down on the (apparently unconcerned) front slug.
Lovely things aren’t they? There is a mucus gland at the rear end of the slug, so it may be that the predator slug was acquiring nutrients the easy way, or it may have been a prelude to mating, or agggressive behaviour. It isn’t something I’ve seen before, but I’m told biting has been reported between Arionids.