Slugs and snails, and puppy dog tails

I found a slug the other day.  Nothing new there, except that this was a rather large slug.  And it was outside.   Aren't they usually you may ask?  Well, I have seen quite a few in the porch and there was one that had a penchant for slithering over the lid of my tea caddy a week or so back, but - at under half-an-inch in length - that was a wee bairn  compared to this fat, juicy specimen with its frilly orange petticoat.  Anyway, I took a picture, as one does.  Any slug specialists out there?