Inside the monarch butterfly migration mystery: flying to Mexico from Canada, the U.S. 12:52 After flying some 3,000 miles from the northern U.S. and Canada to a remote forest in Central Mexico ...

A fter flying some 3,000 miles from the northern U.S. and Canada to a remote forest in Central Mexico for the winter, tens of millions of monarch butterflies are making their way back north.

In the mid-1990s, monarch butterflies could be found on around 45 acres of the same forests covered largely by pine and fir trees, along the border between Michoacan and Mexico states.

The monarch butterfly’s journey is truly epic. Starting in late summer, these delicate creatures travel 2,800 miles from Canada and the United States to the warmer climates of Central Mexico.

This year’s count of 4.42 acres of occupied forest habitat is nearly twice as large as last year's, but eastern monarch butterfly populations remain far below the long-term average.

The Monarch Butterfly Migration Turns This Mexican Forest Orange Every Fall — Here's How to See It. Witnessing the monarch butterfly migration in Mexico should be on every nature-lover's bucket ...

The forest area occupied by monarch butterflies in Mexico has declined over the past 25 years, for reasons including the huge loss of habitat in the biosphere reserve, the WWF report says.

SIERRA CHINCUA, Mexico, Dec 4 (Reuters) - From a distance, they appear like autumn foliage: millions of endangered monarch butterflies blanketing trees in a kaleidoscope of brown, orange and black.

Monarch butterflies take flight in a fir forest in central Mexico, where more than one billion of the insects migrate annually to a small mountainous region in Michoacan State and Mexico State ...

Millions of butterflies stop in these Mexico sanctuaries. Here’s how to see them. Travelers can help protect these delicate insects at the Monarch Butterfly Biosphere Reserve, recognized on ...

MEXICO CITY — The number of monarch butterflies wintering in the mountains of central Mexico dropped 22% from the previous year, and the number of trees lost from their favored wintering grounds ...

At one point, monarch butterflies covered more than 45 acres of forest. Monarch butterflies travel up to 2,800 miles from as far as Canada and New England to their winter sites in Mexico forests ...