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.

Researchers collected several butterflies from Alberta, analyzed their DNA and compared the results to other butterfly species, the study said. Looking at the results, researchers realized they’d ...

The annual migration of monarch butterflies is one of science's great mysteries: millions of monarchs know the correct path even though they have never made the long journey themselves. As 60 Minutes ...

Monarchs traveled to a remote part of Mexico, a journey they've made for thousands of years, and wintered there. Now tens of ...

Find out what the five common bird life stages mean and see how robins and other baby birds look as fledglings, nestlings and ...