Conservation education at zoos, parks and other free-choice conservation settings is geared toward teaching and/or reinforcing certain key conservation messages that relate to the mission of the institution. These messages are communicated through signage, resource elements (e.g., animals, scenic vistas, etc.) and personnel (e.g., docents and interpreters). This book describes a study that examined message communication through docent-visitor interactions at a zoo. Docent and visitor perceptions are compared against actual observed message communication to provide insights into the efficacy of using docents to communicate institutional messages. The study also identifies characteristics of docents that affect accuracy of message communication.