Scientists think they have modeled the internal brain mechanisms that let the winged wonders migrate thousands of miles year after year.
Boatloads of butterflies have just been tallied at a national park in Bolivia.
The common bluebottle has no fewer than 15 classes of cells known as photoreceptors.
The success marks a recovery for the threatened species that migrates across North America.
An insect that went extinct more than 120 million years ago featured many of the traits associated with modern butterflies, including eye spots.
2015 was a year of both breathtaking highs and devastating lows for the animal kingdom.
Actions taken by the United States, Mexico and Canada to protect the migratory species are having a positive effect.
September through November marks the annual autumn journey of the winged beauties, as they make their way to winter homes in California and Mexico.
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