thaumetopoea pityocampa, close up processionary nest on a pine tree

allergy animal attack biology build butterfly caterpillar change climate close cluster color danger dangerous destruction destructive disaster environmental foliage forest hairy image infected infection infestation insect invertebrate irritant irritate irritating irritation larvae leaf moth nature needle nest pest pesticide pine pinus pityocampa poisonous population processionary reproduction silk skin thaumetopoea tree urticaria