As new hardcover in dust jacket. W. L. Moody, Jr., Natural History Series, No. 16. Gehlbach's investigations have been those of not only an academic ecologist, but a suburbanite curious about his natural surroundings. The result is a model of research on species population dynamics and adaptation, yielding an emerging picture of what the eastern screech owl needs for successful coexistence with human neighbors. Based on a twenty-five year study.