large oak processionary moth nest in procession on an oak tree with one single caterpillar crawls across the nest

allergy animal background branch caterpillar caterpillars close closeup cocoon control dangerous deutschland eichen garden germany green grün hairy hazard infection insect landscape larva larvae macro moth nest oak outdoor outdoors park pest plagitis plant procession processionally processionary processioned processonary prozessionsspinner raupitis reaction season spreading spring summer thaumetopoea toxic tree web wood