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The turtles were placed into cloth harnesses and tethered to limit their travel.

turtle in a cloth harness


The turtles were placed into cloth harnesses and tethered to limit their travel and to enable researchers to monitor the direction of their swimming. "Turtles could view the sky, but were restricted to the center of the coil where the magnetic field was uniform," the researchers reported.

Credit: Ken Lohmann, University of North Carolina, Chapel Hill

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Related story: Geomagnetic Landmarks Give Turtles Sense of Where They Are, Where to Go