Behavioral genetics is the study of the role of genetics in animal (including human) behavior. The genetic dissection of behavior in simple animals can provide insight into the mechanisms that regulate human behavioral traits. Once behaviors are understood at the genetic level, it allows the development of animal models of human pathological behaviors, such as stress, anxiety, depression and addiction, which in turn furthers our understanding of these behaviors and opens windows of opportunity for the discovery of treatments. The Cambridge Handbooks in Behavioral Genetics series covers the behavioral genetics of different animal species, some because of their usefulness in medical research and others for the simplicity of their nervous systems. The series is of interest to researchers across several disciplines of the life sciences, primarily those with an interest in the behavioral sciences. The books are advanced texts, from graduate student upwards, and are useful resources for advanced genetics courses, such as genetics of model organisms, mammalian molecular genetics, developmental genetics and animal models of human disease.