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Chill turns monarchs north

Cold weather flips butterflies’ migratory path

Scientists have pinned down the answer to a long-standing butterfly mystery: what flips monarchs’ migratory compasses. A little cold weather may be all that’s needed. Just 24 days in a chilly lab incubator is enough to switch a butterfly’s flight orientation from south to north, researchers report online February 21 in Current Biology.

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