In the Puget Sound area in the NW corner of America, they have many kinds of large slugs.
A common comment is, "Oh, my Lord! When you said,’Banana Slug." I thought you meant the COLOR of a banana, not the SIZE of a banana!"
When you are running barefoot at night, they are icky to step on. If you put salt on them they dissolve. Not a friendly thing to do.
You can put a small, open container of beer in your garden and they drown happy in it.
They sell 6" refrigerator magnets that are VERY realistic slugs. For the aficionado.