Abstract: A popular children's nature magazine, Ranger Rick, was evaluated for its ability to increase children's knowledge of animals and the natural world. A pretest/posttest design was used in a classroom comparison of 491 fifth graders from Wake County, North Carolina. Treatment subjects were given three issues of Ranger Rick magazine over a three-month period and all subjects were tested on the contents of the magazine features. Results show that these children increased their knowledge in portions of three different content areas including animals, plants, and ecological principles. Both treatment and control subjects ranked magazines as their primary source of information about wildlife and the environment. The results of this study indicate that the magazine can be used by classroom teachers as an effective environmental education tool.