Monarchs traveled to a remote part of Mexico, a journey they've made for thousands of years, and wintered there. Now tens of millions of the butterflies are on an epic aerial journey back north.

But for decades, illegal logging threatened the butterfly's roosting spots, which once covered as much as 45 acres. It's now down to four and a half. The population of monarch butterflies in ...

If there is no bird more American than the eagle, there is no butterfly more American than the monarch ... into a world they did not choose, yet shaping the next chapter of a timeless cycle.

Beauty on the Wing: Life Story of the Monarch Butterfly is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV ...