processionary caterpillar row in the forest between pine leaves. space for copy, thaumetopoea pityocampa

allergy animal background behavior biological biology butterfly canine caterpillar caterpillars closeup colourful cooperation dangerous destruction destructive ecology epidemic forest furry group hairy hazard horizontal illness infection infestation insect insecto insects irritation lepidoptera macro metamorphosis moth nature people photography pine pityocampa plague poison procession processionary seasonal spiky thaumetopoea veterinary wildlife worm