four pine processionary caterpillars moving in line on the ground. thaumetopoea pityocampa

pine insect caterpillar processionary thaumetopoea pityocampa larvae larva forest line moth prevention mask pest doggy procession butterfly safety animals nature infestation veterinary health care cute medicine closeup hairy dirt bristles thaumetopoeidae four group woods moving animal ground immunity poisonous sick danger lepidoptera dangerous nobody infection plague