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Bio-what? Bio-logging! Bio-logging refers to a device—a bio-logger—attached to an animal, either directly or mounted on a collar or harness, or even implanted in the animal, that provides data about the animal’s movement, behaviour, or physiology (Figure 1). Bio-loggers are also increasingly used to collect data that focus on the animal’s environment rather than on the animal itself; the animal acts as a bio-monitor, with attached loggers gathering data as the animal moves within (and reacts to) its environment. The data generated by bio-loggers can be saved onto on-board memory for later retrieval, relayed to remote receivers carried by people or positioned at key locations, or uploaded to satellites, sometimes even using the Global System for Mobile communications to receive the latest location of your tagged individual by SMS to mobile devices.