This anthology contains 34 articles published since 1977 in American Scientist, the journal of the scientific society Sigma Xi. Articles illustrate how behaviourists think about and conduct their research, and provide greater insight into the behaviour of selected vertebrate and invertebrate species than most textbook accounts. While sequenced particularly to complement John Alcock's Animal Behavior: An Evolutionary Approach, this readily comprehensible and richly illustrated reader will enhance courses based on other textbooks as well. Indeed, the book can stand alone as a sampler of the excitement and diversity of research approaches and organisms that constitute the modern study of animal behaviour.