By Abhishyant Kidangoor Zoe Jewell was working in Zimbabwe in the 1990s when a harsh reality dawned on her. The female black rhinos (Diceros bicornis) she was helping monitor were suffering from a loss in fertility after they were chased to be collared. Later, when she and a colleague brought it up with the local trackers who accompanied them, they broke out in laughter. Their advice: ditch the radio collars and track footprints instead. The pair took that advice to heart and got to work. Years, and many trials and experiments, later, they now work to help people and organizations around the w…