The pine processionary is a moth of the family thaumetopoeidae. It is one of the most destructive species of moth of pines and cedars in southern Europe. The hairs of the caterpillar cause harmful reactions in humans and other mammals. The species is notable for the behaviour of its caterpillars, which over-winter in tent-like nests in the pine trees, and when hatched, process through the woods in nose to tail columns, protected by their severely irritating hairs.
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