bunch of caterpillars on the ground

bunch caterpillars ground macro insects nature environment entomology outdoors wilderness worms animals biology closeup caterpillar detail natural wild wildlife line pine larva hairy thaumetopoea larvae processionary pityocampa thaumetopoeidae procession brown dirt creepy crawly crawling colony centopiedi centipede catepillars grey pupa follow parasite irritant processionaries close lepidoptera transformation together species processional no people nest