What do such words as "information," "displacement," and "courtship" mean to the growing ranks of ethologists who study animal behavior? Like all sciences, ethology has accumulated its own set of concepts and terms, taken from everyday language, borrowed from neighboring disciplines, or coined especially to describe novel ideas and phenomena. Klaus Immelmann and Colin Beer have responded to the acute need for an authoritative dictionary of ethology with this valuable guide to the world of animal behavior.

The authors present a balance of historical, enduring, and current terminology,...