BIG slug.

Went out a little while ago to give OreoMomma her 3rd (!!) bowlful of dinner today and THIS GUY was back hanging around on the edge of one of her empty bowls. I saw him last night too but didn't have the phonecam in my pocket and just used another bowl -- this morning he was elsewhere -- tonite I didn't notice he was there again until I'd already grabbed the bowl and started to refill it. (so I took the pics then used another, again, so I could put him back down on the patio undisturbed...hope Oreo doesn't notice and eat him?!) With as wet as its been here recently (and with the amount of still un-cleaned-up yard debris out back turning into fresh topsoil) I suppose I shouldn't be surprised but on the other hand I'm also not sure I've really *ever* seen a slug this big...certainly not in my backyard <wow> and he's got such an interesting pattern to him...??? Cool!! ;-) :-)

If there's a better name or description for him (do slugs come in 'sexes'?) I don't know what it is. I'm also assuming slugs are actually good for something biological...do they turn into butterflies eventually like caterpillars do? (I don't think so?) Pretty sure the end of him in pics 1 & 3 is the front, with the little feeler-thingies on it.