This book is a general guide to radio tracking and activity monitoring with pulsed-signal radio tags. The most elementary tags are used to find the animal so that it can be watched, captured or monitored in other ways. Tags can also have their pulses modulated by a variety of simple sensor sub-circuits to telemeter temperature, posture, movement, compass orientation and other aspects of animal activity. The text follows a sequence designed to guide the novice user through all aspects of radio tagging from the planning of a project and the choice of equipment, through field techniques to data analysis. There are details on tag construction and mounting both externally and by implantation. This book will be invaluable to scientists in all branches of ecology and wildlife research, both in showing ways in which radio tagging can be of use and in giving practical details on how to use this technology.