caterpillar larvae of moth pine processionary thaumetopoea pityocampa forming a group on a window sash and pane

allergic allergy animal anti biology caterpillar caterpillars crawl dangerous destroyer distancing ecosystem environment exotic forming glass group hairs harm harmful insect insects irritating larva larvae montenmedia montenmedio moth natural nature orgy pane parasite pest pine pityocampa poison poisonous predator procession processionary sash social spain species thaumetopoea tropical urticating wild wildlife window worm yellow