The cordial reception given the Burgess Bird Book for Children, together with numerous letters to the author asking for information on the habits and characteristics of many of the mammals of America, led to the preparation of this volume. It is offered merely as an introduction to the four-footed friends, little and big, which form so important a part of the wild life of the United States and Canada. There has been no attempt to describe or classify sub-species. That is for the scientist and student with specific interests. The purpose of this book is to acquaint the reader with the larger groups - orders, families, and divisions of the latter, so that typical representatives may be recognized and their habits understood. Instead of the word mammal, the word animal has been used throughout as having a better defined meaning to the average child. A conscientious effort to avoid technical terms and descriptions has been made that there may be nothing to confuse the young mind. Clarity and simplicity have been the objects kept constantly in view.