California gray whales depend on a magnetic sense to find their way through the ocean.
This finding comes from the discovery that whales are more likely to strand on days when there are more sunspots.
Gray whales were an ideal species to test the idea because they migrate 10,000 miles a year from Baja California to Alaska and back and they stay relatively close to the shore, where small navigational errors could lead to disaster, according to study lead authorGranger and her colleagues studied 186 live strandings of gray whales over a period of 31 years, and found that gray whales were more than four times more likely to strand when a lot of radio frequency noise from a solar outburst was...
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