Close up of two black slugs creeping together in line, on top of rock, slow motion

european black slug large black slug arionidae land slug gastropod slug mollusk snail shallow depth of field invertebrate terrestrial slimy slither wildlife black arion omnivorous tiny shallow focus tentacles crawl small slowmo slow arion slomo arion ater top animal slow motion closeup close up stone rock black garden shiny two glisten together follow texture nobody creep brown wet no people line