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Thursday, October 28, 2010

Photo: Toxic Substance Allows Birds to "See" Magnetic Field


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An African goshawk is seen on Bioko Island, Equatorial Guinea, in an undated photograph.

Low amounts of a toxic substance give birds the ability to "see" Earth's magnetic field as they navigate on long journeys, a June 2009 study says.

Photograph by Tim Laman/NGS