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Bridget Kendall and guests explore the shadowy world of tracking and surveillance. As the ability of technology to monitor our online behaviour and even our physical movements in the workplace increases, how far should we be prepared to compromise privacy in the interests of security and efficiency? And how can the same technology be employed to better track endangered species? Finnish cyber-security expert Mikko Hypponen, Kenyan vulture scientist Munir Virani, and Australian political geographer Anja Kanngieser give their views. Photo: A satellite navigation system. Credit: Andersen/AFP/Getty Images