Luna moths may be one of Oklahoma?s largest moths, but these giants start out as tiny eggs about one-third the size of a BB pellet. After hatching, caterpillars feed on the leaves of the persimmon, black walnut or other hardwood host plants for 5 - 6 weeks while undergoing several molts. The fullygrown caterpillars then crawl or fall to the ground and wrap themselves in a silk-bound leaf at the bottom of the host tree. Adult moths have about one week to find a mate and produce the next generation before they die.