Cinnabar moth caterpilar

These caterpillars are orange and black stripped with long hairs. They become a beautiful red and black colored moth.
They are beneficial because they feed on ragwort. This herb is poisonous for grazing animals (horses, cattle, etc.) because it contains alkaloids:
http://www.projectnoah.org/spottings/6578247
So the moth caterpillars can be used as biocontrol agent to reduce ragwort in grazing fields. Both the caterpillar as the moth become unpalatable by eating this plant.