The journal Endangered Species Research  has published a Theme Section  examining the tracking of marine vertebrates in relationship to their oceanic environment. This publication features the papers from the Biologging III  conference hosted by TOPP in September, 2008. The volume includes fully peer-reviewed papers presented as part of the Biologging III Symposium (Monterey, August 2008) which was co-hosted by the Tagging of Pacific Predators  (TOPP) and Tag-a-Giant  (TAG) programs. Symposium presentations showcased how the state of the art in biologging technologies was being used to unlock the ecology, physiology and conservation biology of a range of vertebrate species. The papers in the present volume represent the breadth and novelty of the research conveyed at the symposium along with additional related papers submitted independently.