closeup on caterpillar aggregation of the small tortoiseshell butterfly, aglais urticae

arthropoda aglais urticae arthropod black butterfly color ecology european insect lepidoptera magnification nature nymphalidae plant urtica diocia animal background biology brushfooted butterflies brushfoots caterpillar closeup common nettle entomology feeding invertebrate isolated macro natural leaf nymphalids orange outdoor single small tortoiseshell stinging summer vertical wild wildlife aggregation