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

As the crisp mountain air warms, they flutter above dazzled visitors who have come to see an annual tradition that persists despite the environmental and human pressures threatening it.

Every year, migratory monarchs travel up to 2,000 miles (3,000 km) from the eastern United States and Canada to spend the winter among the forests of central and western Mexico."

Brendan O'Boyle and Alberto Fajardo report for Reuters December 4, 2022. [2]