slug, dusky arion, arion subfuscus, terrestrial snail eating a mushroom in the forest

arion snail slug terrestrial subfuscus closeup gastropoda mollusca dusky nature animal mollusk wildlife gastropod macro cute entomological cautious close creature biology biological entomology land horizontal looking eye stalks eyes environment warily retracted waiting wild arionidae roundback brown one applanatum color artists conk pulmonate ganoderma resting fungi fungus eating mushroom forest