Colors of the Walnut Sphinx Moth differ between individuals so it makes identification of this species a bit more challenging than usual. Overall, they maintain a light or dark brown coloring with bands of white or even pink. The patterns along the wings may or may not appear highly visible at first. With wings extended, these insects tend to take on a more rectangular shape when viewed from above. Their antenna are comb-like and their bodies appeared to be covered in a thick hair with the exception of their leg ends.
Adult Walnut Sphinx Moths do not eat. They can produce a single brood in the northern states, between May and August, but two broods in the warmer south.
Walnut Sphinx Moth caterpillars eats the leaves of walnut, butternut, hickory, alder, beech, hazelnut and hop-hornbeam trees. They are capable of making a "squeaking" sound when threatened. It is likely a defensive move that startles a potential predator enough to leave them alone.