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Millions of monarch butterflies spend the winter at Sierra Chincua in Mexico, one of only five places on earth where monarchs winter before migrating back north in spring. Logging threatens this gathering – after forest was cleared from one of the sites, the monarchs stopped visiting it. Even though the area is a World Heritage site with 56,000 hectares set aside, logging continues.

Millions of monarch butterflies spend the winter at Sierra Chincua in Mexico, one of only five places on earth where monarchs winter before migrating back north in spring. Logging threatens this gathering – after forest was cleared from one of the sites, the monarchs stopped visiting it. Even though the area is a World Heritage site with 56,000 hectares set aside, logging continues.

Monarch butterfly populations have plummeted due to habitat loss, illegal logging, parasites and climate change.  With the future of their spectacular migration in jeopardy, is there any hope for a...

Monarch butterfly populations have plummeted due to habitat loss, illegal logging, parasites and climate change. With the future of their spectacular migration in jeopardy, is there any hope for a...

"monarch butterfly" - The monarch butterfly of North America logged 1, 870 miles [3, 010 km] on its migration flight.

"monarch butterfly" - The monarch butterfly of North America logged 1, 870 miles [3, 010 km] on its migration flight.

Millions of monarch butterflies (Danaus plexippus) roost on the Sierra Chincua (Chincua mountain) near Angangueo, Mexico. This is one of five wintering roosts for monarchs, where the cool mountain climate slows their metabolism enough for them to overwinter before migrating back northward in the spring. Logging threatens this spectacle: already one of the five sites is no longer used by the butterflies due to the forest being cleared.

Millions of monarch butterflies (Danaus plexippus) roost on the Sierra Chincua (Chincua mountain) near Angangueo, Mexico. This is one of five wintering roosts for monarchs, where the cool mountain climate slows their metabolism enough for them to overwinter before migrating back northward in the spring. Logging threatens this spectacle: already one of the five sites is no longer used by the butterflies due to the forest being cleared.

Monarch migration | Picture of thousands of Monarch butterflies flying and congregating in ...

Monarch migration | Picture of thousands of Monarch butterflies flying and congregating in ...

In Mexico,illegal logging has remained a problem. It more than tripled in the monarch butterflies' wintering grounds in 2014, reversing several years of steady improvement in the insects' numbers

The mountain where Monarch butterflies gather across 10 acres

In Mexico,illegal logging has remained a problem. It more than tripled in the monarch butterflies' wintering grounds in 2014, reversing several years of steady improvement in the insects' numbers

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