It’s about time for people in the Northern climes to say goodbye to the butterflies for the winter. How do these delicate creatures manage to migrate such long distances? It turns out they have a G.P.S. in their antennae.

Every fall about 100 million Monarch butterflies migrate to the south. On BBC News, Judith Burns quote researchers as saying, “North America’s Monarch butterflies use a 24-hour ‘clock’ in their antennae to help navigate the [incredible distance] to overwinter in Mexico.” This “clock” is located in their antennae, not in their brain.

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