Study: Monarch butterflies may use magnetic compass for autumn migrations to central Mexico

June 24, 2014 3:29 PM

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Study: Monarch butterflies may use magnetic compass for autumn migrations to central Mexico

NEW YORK – A new study suggests that monarch butterflies use an internal magnetic compass to help navigate on their annual migrations from North America to central Mexico.

Scientists already knew they navigate by the sun. But the insects do just fine on very cloudy days, leading to suspicions they also use a magnetic compass, like migratory birds and sea turtles. Previous studies haven't made a clear case for that, according to researchers who report the new work Tues...

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