caterpillar of a marching silkworm thaumetopoea pityocampa on a nest on a pine tree in greece

allergy animal animals background biology black bokeh branch bug caterpillar closeup danger dangerous dead doctor environment european fauna flora forest form greece hearts infection infestation insect larva larvae lepidoptera marching medicine moth natural nature nest outdoor parasite pest pine pityocampa plague poisonous prevention silkworm thaumetopoea tree veterinary wildlife worm