Magnetic Sense Shows Many Animals the Way to Go (preview)

For what must have felt like an interminable six months back in 2007, Sabine Begall spent her evenings at her computer, staring at photographs of grazing cattle. She would download a satellite image of a cattle range from Google Earth, tag the cows one by one, then pull up the next image.

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Magnetic Sense Shows Many Animals the Way to Go (preview)