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An unmistakable caterpillar. Nice to find. There is a typo in the spelling of the common name. This should be Cinnabar.
University of Edinburgh and Biodiversity Observatory (OU)
A distinctive caterpillar, feeds mainly on ragwort. Ragwort is a major problem, it contains a group of chemicals known as alkaloids which cause liver damage in horses and other mammals. Cinnabar caterpillars are important in that they are one of the few creatures which can eat ragwort without any ill effects. Instead they have evolved a way of storing the alkaloids in their bodies so they become bitter tasting and poisonous to predators. In New Zealand they are being used successfuly as a biological control for ragwort, which was accedentally introduced into the country.
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Presumably the Cinnabar isn't native either?
You are right, the cinnabar were introduced to control the introduced ragwort; one of the few times such biological control has worked.
Lat/Lng: 52.3, -0.6
OS grid ref: SP9672