A Guide to Familiar American Species: A Golden Nature Guide. New York: Simon and Schuster. 160 pp. (Heterodon contortrix, pp. 81, 156). External links Eastern Hognose Snake, Reptiles and Amphibians of Iowa. Colubrids Reptiles of the United States Reptiles of Ontario Fauna of the Great Lakes region (North America) Fauna of the Eastern United States Fauna of the Southeastern United States Reptiles described in 1801