animals with an internal skeleton of cartilage or bone. These include fish, reptiles, amphibians, birds and mammals. Selected References Conant, Roger, 1975. A Field Guide to Reptiles and Amphibians of Eastern and Central North America. Boston: Houghton Mifflin. 2nd ed. Peterson Field Guide Series. Halliday, Tim and Kraig Adler, ed. , 1986. The Encyclopedia of Reptiles and Amphibians. New York: Facts On File. McMehrtens, John, 1987 Living Snakes of the World in Color. New York: Sterling Publishing Company. Sharps, Jon C.. and Ted Benson, 1984. A Compiled List of South Dakota Wildlife, South Dakota Department of Game, Fish and Parks, Pierre, SD. Sweeney, Roger, 1992 Garter Snakes, Their Natural History and Care in Captivity. London: Blandford. Selected Resources for Teachers Caduto, Michael and Joseph Bruchac. Keepers of the Earth: Native American Stories and Environmental Activities for Children. Golden, CO: Fulcrum Press. 1988. Caduto, Michael and Joseph Bruchac. Keepers of the Animals: Native American Stories and Wildlife Activities for Children. Golden, CO: Fulcrum Press. 1991.