More is known about the behavior, anatomy, and molecular biology of the laboratory rat than any other animal species. Although its natural history and psychological functions have been described previously in books, this is the first comprehensive description of its behavior. Both seasoned and beginning investigators will be amazed at the range and complexity of the species 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 investigators to correlate the behavior and methods and exploit them in their own research. This book will serve as an indispensable resource for neuroscientists, psychologists, pharmacologists, geneticists, molecular biologists, zoologists, and their students and trainees.