Sexual Dimorphism
Differentiating between sexes of this species is very easy. The most obvious difference is the plumose antennae. Males will have very bushy antennae while females will have moderately less bushy antennae. The male's bushy antennae are used to detect pheromones released by unmated females. Another difference is that the females will be slightly larger in the abdomen due to carrying eggs. There is a surprising amount of variation within this species. Color patterns can range from a reddish-cinnamon to a dark brown but are almost always a shade of brown.
Read more about this topic: Antheraea Polyphemus