Arion Rufus A.k.a. Red slug
I was able to catch this over 10 cm monster just as it was extending it's antennae. This is typical hunting method, by which the Arion is able to submit it's pray (usually leaves, grass or rotting wood). Notice the "this is Sparta!" attitude of the slug, and the instant shriveling of the powerless leaf.
Just kidding, but still, nature is great!