pine processionary caterpillars moving in line on the ground

animal brown catepillars caterpillar centipede centopiedi close closeup colony crawling crawly creepy day dirt follow grey ground hairy insect insects irritant larva larvae lepidoptera life line macro nature nest parasite people pine pityocampa procession processional processionaries processionary pupa species stone stones thaumetopoea thaumetopoeidae together transformation wild wildlife worm