Nikolaas Tinbergen has devoted a lifetime of research to exploring the behavior of many types of animals in their natural environments, and has founded centers of worldwide renown for research and teaching in the behavioral sciences, first in his native Holland and later at Oxford. His influence extends far beyond the borders of Europe and zoology proper, and he has contributed substantially to international and interdisciplinary collaboration. He has tirelessly worked for the use of scientific methods in the study of human behavior, both normal and abnormal.

Volume I is devoted to field studies. Volume II includes accounts of Tinbergen’s remarkable laboratory experiments as well as his significant general papers. These selections explore the search for animal roots of human behavior, behavior and natural selection, appeasement signals, and the nature of ethology.

“Early Childhood Autism,” written by Professor Tinbergen and his wife, is among the most important papers. It is a pioneer work in applied ethology and is a product of thirty years of observing non-verbal expression in both animals and children. Also included is Professor Tinbergen's 1972 Croonian Lecture, “Functional Ethology and the Human Sciences.”

These classic original studies will fascinate the increasing number of readers interested in the topical problems of animal and human behavior.

Together with Konrad Lorenz, Niko Tinbergen is generally acknowledged as the founder of the young science of ethology. Professor Tinbergen has spent a lifetime of research exploring the behavior of many types of animals in their natural environments, and has founded centers of worldwide renown for research and teaching in the behavioral sciences, first in his native Holland and later at Oxford. His influence extends far beyond the borders of Europe and of zoology proper, and he has contributed substantially to international and interdisciplinary collaboration.

Tinbergen’s work has been characterized by many as a “breath of fresh air” in fields that were in danger of losing touch with nature and of becoming bogged down in theory. He has tirelessly worked for the use of scientific methods in the study of human behavior, both normal and abnormal. Without shying away from quantification and measurement, he has made his main contribution in what Sir Peter Medawar calls “creative observation” and in the design of meaningful experiments, even in the seemingly chaotic and continuously varying conditions of the natural habitat.

In following him in what Tinbergen likes to call his seemingly aimless wanderings, the reader will catch a unique glimpse into the workshop of ethology. Even when reporting on sophisticated experiments, or when developing new theoretical concepts and arguments, Tinbergen writes simply, lucidly, and precisely. The present volume spans forty years of pioneer investigation and includes selections on the behavior of gulls; on the homing, landmark preference, and prey findings of the digger wasp; on the food hoarding of foxes; and on creatures living scattered as a defense against predators.

These classic original studies will fascinate the increasing number of readers interested in the topical problems of animals and human behavior.

Representative of the international acclaim accorded Ernst Mayr's Animal Species and Evolution, published in 1963, is Sir Julian Huxley's description of it as "a magistral book...certainly the most important study of evolution that has appeared in many years—perhaps since the publication of The Origin of Species." In his extraordinary book, Mayr fully explored, synthesized, and evaluated man's knowledge about the nature of animal species and the part they play in the process of evolution.

In this long-awaited abridged edition, Mayr's definitive work is made available to the interested nonspecialist, the college student, and the general reader. The author has retained the dominant themes of his original study—themes now more widely accepted than they were in 1963: the species is the most important unit of evolution; individuals (and not genes) are the targets of natural selection, hence the fitness of "a" gene is a nebulous if not misleading concept; and the most important genetic phenomena in species are species-specific regulatory systems that give species internal cohesion.

Each of the twenty chapters of the original edition has been revised; six have been extensively reworked. Discussions of peripheral subjects and massive citations of the literature have been eliminated, but the glossary has been greatly expanded. The focal point of the volume is, naturally, the species—a reproductively isolated aggregate of interbreeding populations. Presenting an overview of evolutionary biology in Chapter 1, Mayr then considers the nature of species, their population structure, their biological interactions, the multiplication of species, and their role in evolution.

Because of the impossibility of experimenting with man and because an understanding of man's biology is indispensable for safeguarding his future, emphasis throughout the book is placed on those findings from higher animals which are directly applicable to man. The last chapter, "Man as a Biological Species," is of particular interest to the general reader. Mayr concludes that while modern man appears to be as well adapted for survival purposes as were his ancestors, there is much evidence to suggest that he is threatened by the loss of his most typically human characteristics.