Scientists have recently mapped the painted lady butterfly's annual flight from equatorial Africa to northern Europe and back ...

These estimates, drawn from the location data of three billion Facebook users, provide a view of human migration in extraordinary detail.

This was a monument to an extraordinary reversal in human migration: For the first time ... the treacherous Darién jungle and into Panama en route north to the United States.

Though they've been a common sight throughout human history ... scientists called the Worldwide Painted Lady Migration Project has traced their route. Over the past decade, they've identified ...