the red slug, large red slug, chocolate arion or european red slug arion rufus on a dry forest trail

agriculture animal antenna arion attack biology black body brown canton chocolate closeup contract control crawl creatures damage danger dry eating european flower forest gallen garden gastropod green invasion invasive invertebrate land large leaf macro mollusc mollusk natural nature or outdoor pest plant problem red rufus slimy slippery slow slowly slug snail st switzerland trail vulgaris wet wild wildlife