Gallery :: Cinnabar larva on ragwort
Below is the image you have selected.
Cinnabar larva on ragwort
Pic by Keith Noble. The caterpillars absorb toxins from eating the ragwort which makes them unpleasant to eat. That's why they have the yellow and black warning colouration.
Added 06/06/2019 13:09
More Information - Tyria jacobaeae (The Cinnabar)