For thousands of years, millions of monarch butterflies have migrated from the northern U.S. and Canada to Mexico for the winter. But exactly how they know where to go is still a mystery.

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.

Sightings of monarch butterflies have been seen predominantly near southern cities like Savannah and St. Mary's, according to ...

Monarch butterflies are migrating through San Antonio, laying eggs on milkweed, while other species like the Gulf fritillary ...

The latest official report of monarch butterflies overwintering in Mexico has just been released and offers some ...

Sightings of monarch butterflies have been seen predominantly near southern cities like Savannah and St. Mary's, according to Journey North's interactive migration map. Here's what we know ...