Hikers trekking through unfamiliar territory are well advised to carry a compass, if not a GPS unit, to stay on course. Other animals are lucky enough to have complex navigational equipment in-built. New research reveals that Israel's blind mole rat (Spalax ehrenbergi) uses the Earth's magnetic field on long journeys, much like a compass, to continuously monitor and maintain its course.
http://news.nationalgeographic.com/news/2004/01/0129_040129_blindmolerat.html
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