This book provides observations on woodrats. The eastern woodrat has a significant impact on its community members by eating plants, giving refuge in its stick house for many other tiny creatures, and supplying food for certain meat eaters. During the eight-year study of these rodents on the University of Kansas Natural History Reservation, from February 1948 to February 1956, this effect altered dramatically as wood rat populations shifted in density and area inhabited. This research examines the wood rat population on the Reservation, the changes that the species goes through, and the variables that influence them.