Chill turns monarchs north

Chill turns monarchs north

Cold weather flips butterflies’ migratory path

By Meghan Rosen, 13:49 PM February 21, 2013

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.

“It’s pretty doggone cool,” says insect ecologist Orley “Chip” Taylor of the University of Kansas, who was not involved in the new research. But the finding ...

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