Antarctic seals may use Earth's magnetic field to navigate while hunting

Weddell seals have biological adaptations that allow them to dive deep—as much as of hundreds of meters—while hunting, but also an uncanny ability to find the breathing holes they need on the surface of the ice. Now, researchers supported by the National Science Foundation (NSF) believe they have figured out how they do it—by using the Earth's magnetic field as a natural GPS.

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