Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Horses exhibit a diverse array of coat colors and distinctive markings. A specialized vocabulary has evolved to describe them. Color is one of the first things that is noticed about a horse. Often, a horse is first described by its coat color rather than by breed or by sex. While most horses remain the same color throughout life, a few, over the course of several years, will develop a different coat color from that with which they were born. This book studies equine coat colors including chestnut coat, gray horse, dun gene, grullo, and sooty gene. Project Webster represents a new publishing paradigm, allowing disparate content sources to be curated into cohesive, relevant, and informative books. To date, this content has been curated from Wikipedia articles and images under Creative Commons licensing, although as Project Webster continues to increase in scope and dimension, more licensed and public domain content is being added. We believe books such as this represent a new and exciting lexicon in the sharing of human knowledge.