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.

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

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.

The plight of the monarch butterfly could cost farmers a valuable ... The eastern population of the monarch overwinters in Mexico, and the western population overwinters along the California ...

The peak of the spring monarch butterfly migration in Texas typically occurs from late March to early April. See where on Journey North.

Scientists assess US monarch populations each winter by measuring the area they occupy in this fir grove in Mexico, and by counting butterflies in coastal California, where monarchs west of the ...

and southeast Canada to the mountain forests in central Mexico. With its notable orange and black markings, the monarch butterfly is one of the most recognizable insects in the world. In North ...

A kaleidoscope of orange-and-yellow monarch butterflies soon will return to Michigan as they finish their overwintering in Mexico and Central America and begin fluttering home to breed.

The monarch butterflies are starting to come through San Antonio and the rest of Central Texas on their migration from Mexico to Canada. If you have milkweed growing in your landscape or area ...

WWF works to sustain the natural world for the benefit of people and wildlife, collaborating with partners from local to global levels in nearly 100 countries.