Giant Swallowtail (Papilio cresphontes)
Giant Swallowtail Papilio cresphontes Iowa
Giant Swallowtail butterfly (Papilio cresphontes) on a milkweed flower at Geode State Park in Iowa.

Details:  Canon AE-1,  Kodachrome film printed and later scanned.
 

Selected References:

Brock Jim P., Kaufman Kenn. Butterflies of North America. New York: Houghton Mifflin Company, 2003. P 38-39.

Struttmann Jane M. USGS Northern Prairie Wildlife Research Center. "Giant Swallowtail (Papilio cresphontes)." Butterflies of North America / Butterflies of Iowa. <http://www.npwrc.usgs.gov/resource/distr/lepid/bflyusa/ia/701.htm > (15 Sep. 2004)