close-up of the spanish slug (arion vulgaris or arion lusitanicus) on the ground

animal arion lusitanicus vulgaris europe spanish slug wildlife agricultural pest alien brickred brown close closeup crawling damage dangerous detail dirty orange eating ecosystems environment european farming fauna garden grass ground horticultural invasion invasive land large macro meadow nature outdoor parasites plant slime slimy soil species summer wild worst close-up brick-red ground