Photo: Raquel Cunha

From a distance, they appear like autumn foliage: millions of endangered monarch butterflies blanketing trees in a kaleidoscope of brown, orange and black.

Source: In Mexico, endangered monarch butterflies inspire hopes of a comeback

Photo: Sylvain Cordier

Located about 60 miles from Mexico City, the Monarch Butterfly Biosphere Reserve—a UNESCO World Heritage Site—receives up to a billion migrating butterflies every winter.

Source: Millions of Monarch Butterflies Flock to This Mexican Forest Every Fall

Watch the trees turn orange with butterflies.

Source: Where to see thousands of migrating monarch butterflies in Mexico this winter

Witnessing the monarch butterfly migration in Mexico should be on every nature-lover’s bucket list.

Source: This Mexican Forest Turns Orange Every Fall Thanks to the Monarch Butterfly Migration

Monarchs are an iconic butterfly species found around the world. But the Eastern North American subspecies is the only one to make an annual migration that can span from the Sierra Madre Mountains in Mexico to Southern Canada.

Source: Magical migration of the monarch butterflies

Mexico – Monarch Butterfly Biosphere Reserve

This is a story that must begin at the end. But oh, what an end. Terri Colby stood on a forested mountaintop in Mexico in late February, mesmerized by monarch butterflies swirling around him, darting in and out of the trees and pockets of sunlight. They were high in the blue skies, clumped by the thousands on tree trunks and branches, clustered on woodland flowers and swarming in small streams of water on the forest floor. The sound of their wings was like a whisper on the breeze.

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Photo credit: AP

The sight of millions of these butterflies painting forests in blazing colours makes for a wonderful experience…

Source: Monarch butterfly magic in Mexico

Photo credit: Arlene & Robin Karpan

Bold splashes of orange speckle the blue sky as countless Monarch butterflies fill the air and land on branches, logs, the ground and even on our heads and shoulders.

Source: Monarchs are Mexico’s other North American tourists | The Western Producer