Approximately three percent of newborn humans have congenital anomalies with significant cosmetic and/or functional consequences. Much of our ability to understand what has gone awry in these birth defects rests with development of animal models for them; the mouse has emerged as the model organism of choice for these studies. This volume reviews mouse models of specific developmental genetic diseases, including neural tube defects; cleft lip and/or palate; congenital heart disease; ciliopathies; hereditary deafness and others to provide conceptual insight into congenital anomalies generally....