The annual migration of monarch butterflies is one of science's great mysteries: millions of monarchs know the correct path ...

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.

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

This proposal is a big deal — monarchs are among the most recognizable and beloved animals in the US — and a long time coming ...

Monarch Watch and local conservationists are scheduled to appear on 60 Minutes on Sunday evening, giving a national audience ...

One Thousand Trees continues its All Creatures Great and Small series of events focussing on animals, with a timely screening ...