Four examples of thorny or hairy plant stems: a rose, barberry, plum and stinging nettle. Coloured etching by F. Sansom, c.… https://www.rawpixel.com/image/13956462/image-paper-flower-plantFree Image from public domain licenseCommon barberry (Berberis vulgaris) with an associated moth, its caterpillar, chrysalis and anatomical segments. Coloured… https://www.rawpixel.com/image/13956758/image-dog-butterfly-flowerFree Image from public domain license