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The Thickness of a thumb and 1 1/2 times as long.
Found these two on the side of a fallen fir tree in the forest near Cultis Lake.
These two were mostly yellow, but saw a green one as well. Left shiny clear slime on the sides of the trees. Probably some garden variety type of slug, but I've never seen any as big as these before.
I've moved this slug from the Arthropod category to the Other category for you. Snails and slugs are Mollusks. Arthropods have an exoskeleton and jointed limbs in at least one phase of their life. Think dragonfly, bee, crab, and ant.
Banana slug, though I don't know how to differentiate the three species.
http://en.wikipedia.org/wiki/Banana_slug...