If Birds Left Tracks in the Sky, They’d Look Like This

This story appears in the January 2018 issue ofNational Geographic magazine. If birds left tracks in the sky, what would they look like? For years Barcelona-based photographer Xavi Bou has been fascinated by this question. Just as a sinuous impression appears when a snake slides across sand, he imagined, so must a pattern form in the wake of a flying bird.

In the January 2018 edition of National Geographic Magazine, the Barcelona-based photographer Xavi Bou documented the “footprints” that birds leave in the sky over the course of 5 years, in this beautiful exposition.