Categories DavidDeterrence: peacock butterfly caterpillars Post author By David Post date 9 July 2015 Peacock butterfly caterpillars on their preferred food plant, nettles. Their backs are covered in hairs and spikes, in a probably not entirely successful measure to try to make them unpalatable to hungry birds. ← Bog cotton, Sutton Park → Snapdragon “wallflowers”, Bridgnorth Castle