large slug on dirty green field

when i trekked to the end of the driveway at lunchtime today to retrieve our (thankfully emptied) waste and recycling receptacles, i noticed a sizeable slug in our tub for glass. i do not think it had been there, among all those bottles, when i hefted the container in the rain this morning. i took an inordinate number of photographs of this slug. none of them came out so well; these i think are among the best. the thing was 4 inches long and it moved at a pretty good clip. (it must have been moving fast because the rest of the pictures were blurry.)