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Miraculous migration of the monarch

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Lets say weve tasked NASA or the CIA to design a device weighing half as much as a paper clip. We want this device to be able to fly. In addition, we want it capable of navigating as far as 3,000 miles to a specific location, refueling on its own. Its doubtful it could be done with current technology. Yet that is exactly what nature long ago accomplished in the form of the Monarch butterfly (Danaus plexippus).

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