Tracking Sheep with GPS

NPR's Melissa Block talks to Gerry Scully of the Irish food and agricultural authority about the use of GPS tracking devices to monitor the movement of sheep in County Mayo. Sheep have been overgrazing certain spots, and in order to better understand their instincts and behavoirs, the GPS collars and a computer hook-up have been recording sheep habits for nine months. The experiment goes on for two more years.

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