Both seasoned and beginning investigators will be amazed at the range and complexity of rat behavior as described in the 43 chapters of this volume. The behavioral descriptions are closely tied to the laboratory methods from which they were derived, thus allowing the investigator to exploit both the behavior and the methods for their own research. It will also serve as an indispensable reference for other neuroscientists, psychologist, pharmacologists, geneticists, molecular biologists, zoologists, and their students and trainees.