close-up of the brick-red, dirty orange or brown spanish slug (arion vulgaris or arion lusitanicus) on the ground

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