Hickory horned devil
1 of 2
Hickory horned devil, the caterpillar of the royal walnut moth
Bob Warrick / Wikimedia Commons
2 of 2 — Citheronia_regalis_–royal-walnut-moth(48426621746).jpg
Citheronia regalis, or royal walnut moth
Andy Reago & Chrissy McClarren / Wikimedia Commons
Citheronia regalis, the regal moth or royal walnut moth, is a North American moth in the family Saturniidae. The caterpillars are called hickory horned devils. The adult (imago) has a wingspan of 3.75-6.1 in (9.5-15.5 cm). The species was first described by Johan Christian Fabricius in 1793.