Altho the popular attitude toward snakes has always been hostile, most of them are harmless and they are often of great value to agriculture. The common practice of killing every snake that shows its head grows out of a lack of knowledge about these animals and their frequent usefulness. It is of economic importance to agriculture in Iowa and elsewhere to have available information as to the useful species of snakes, and ways of separating them from the harmful kinds.
Guthrie, J. E.
"The snakes of Iowa,"
Bulletin: Vol. 20
, Article 1.
Available at: https://lib.dr.iastate.edu/bulletin/vol20/iss239/1