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When Dr. Lyle K. Sowls began his studies at Delta in 1946, many wide gaps remained in the knowledge of the relationship of breeding ducks to their home range. There were many scattered observations and a growing mass of data accumulated through the study of banding returned; but the activities of individual ducks during the critical spring months and the activities and the fate of broods each summer remained largely a mystery. Sowls, working toward his doctorate in wildlife management as a graduate student of the University of Wisconsin, studied the waterfowl at Delta for five years in an attempt to plug some of those gaps through intensive study of the waterfowl on one limited are. His studies developed new techniques and brought out new facts that were startling even to waterfowl biologists, facts of prime importance to the duck hunter or to any one interest in the future of America's waterfowl flights. As a result of Dr. Sowls' research, new light has been shed on such factors as predation, renesting, and homing habits of the important species of game ducks, and already have become the basis for revised hunting regulations and give a new understanding of waterfowl problems.

Everything the sportsman or naturalist would wish to know about the elk in included in this volume. Habits, food preferences, seasonal movements, anatomy, antler development, and management problems are interestingly and thoroughly discussed. Written by one of America's greatest field naturalists, this new book has behind it a lifetime spent in intimate study of the subject. Dr. Murie is recognized as the world's foremost authority on the American elk and his comprehensive research on elk in the Jackson Hole National Monument forms the basis for this book. Everyone interested in America's wildlife will want this volume in his library. The book is copiously illustrated with half-tone and original line drawings by the author.

Here is the dramatic story of the life of the black duck, from the time the broods hatch on the spruce-lined ponds of eastern Canada, through the hazardous flights to the southern wintering areas, to the return of the paired birds to the nesting grounds in spring. It is a story told authoritatively by a Canadian scientist whose adult life has been spent in studying the black duck from the fastnesses of its northern breeding grounds in Labrador and Ungava Bay, to the marshes of Louisiana. In this book are facts on the black and other species of waterfowl that will be new to many students of waterfowl as well as to sportsmen. Here also are recommendations for perpetuating the flights of these magnificent game birds.

The book is a complete scientific study of the subject from every angle, interestingly spiced with anecdotes from the author's own rich personal experience. How big is a "big" bobcat? How serious is bobcat predation on game animals? How can a small bobcat pull down and kill a deer five times its own weight? What are the habits and habitat of the bobcat? What are the ranges of its various scientifically recognized races? All of these questions and many more are answered in the pages of this generously illustrated book.