The Purple Emperor (Apatura iris) is a Eurasian butterfly of the Nymphalidae family. Adults have dark brown wings with white bands and spots, and a small orange ring on each of the hindwings. Males have a wingspan of 70–80mm, and have an iridescent purple-blue sheen that the slightly larger (80–92mm) females lack. The larvae (caterpillars) are green with white and yellow markings, and have two large ‘horns’ at the anterior end and a smaller one at the posterior.