The origin of this volume and the symposium proceedings it records can be traced to the deliberations of the National Academy of Sciences' Animal Orientation and Tracking Committee of the 1969 Space Biology Summer Study at Santa Cruz, California, whose members pointed to the potential role of satellites and recent bioengineering developments as a means of gaining information about the many questions of animal travel, particularly the mechanisms involved in long-distance navigational ability. Coming several years since its predecessor conferences, at a time of a new popularization of ecology...