Me too, however, I had not yet the privilege to see one ;-)...
Here is some info about the principle host plant:
http://en.wikipedia.org/wiki/Jacobaea_vulgaris
And the reports from US, where both, caterpillar AND host plant were introduced, or better, after the pest of the ragwort, the caterpillar was introduced as well for pest control.
http://bugguide.net/node/view/685994/bgimage
http://bugguide.net/node/view/3823
http://www.projectnoah.org/spottings/526136014
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