This is a bit repetitive. Someone has already id'd it, but I thought this info from "What's that bug" was interesting Your Polyphemus Moth, Antheraea polyphemus, belongs to the same Family as the Luna Moth. Both are Saturnids or Giant Silkworm Moths. Caterpillars eat leaves from many deciduous trees and adults do not feed, living only a few days to mate and reproduce.