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Fauna: Polyphemus Moth Polyphemus Moth Antheraea polyphemus The Polyphemus Moth is one of the largest moths in North America, with a wingspan up to six inches. The large green caterpillars can be found feeding on a variety of tree species during the summer. Northern populations have one generation per year, while those to the south may have two generations per year. The adults do not feed. They can be attracted to lights at night, as the individual pictured above was. Polyphemus Moths are members of the Family Saturniidae, and are also known as Giant Silkworm Moths, so named because of their size and the silken cocoons in which they pupate. Photos of several other species of Giant Silkworm Moths are available on this site, as are photos of members of a closely related family, the Royal Moths. Other Giant Silkworm Moths: Io Moth Luna Moth Promethea Moth Royal Moths: Imperial Moth Royal Walnut Moth