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Logging has taken its toll on a former wintering roost for monarch butterflies near Angangueo, Mexico.

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Logging has taken its toll on a former wintering roost for monarch butterflies near Angangueo, Mexico.

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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.

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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.

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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.

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Monarchs (Danaus plexippus) in the Sierra Chincua sanctuary, Mexico.

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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.

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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.

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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.

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ANI082-00118

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.

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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.

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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.

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ANI082-00121

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.

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Joel Sartore on assignment at Sierra Chincua in Mexico, home to the world’s largest gathering of monarch butterflies.

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Logging has taken its toll on a former wintering roost for monarch butterflies near Angangueo, Mexico.

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Federally threatened Bay Area checkerspot butterflies, now nearly extinct (Euphydryas editha bayensis) at the Maguire Center for Lepidoptera and Biodiversity, Gainesville, FL.

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Monarch butterflies (Danaus plexippus) from Sierra Chincua, Mexico.

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A Hesperid butterfly caterpillar (Pyrrhochalcia iphis) on Bioko Island, Equatorial Guinea.

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A Hesperid butterfly caterpillar (Pyrrhochalcia iphis) on Bioko Island, Equatorial Guinea.

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A girl holds a monarch butterfly at the Lincoln Children’s Zoo.

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A girl holds a monarch butterfly at the Lincoln Children’s Zoo.

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Palos Verdes blue butterflies (Glaucopsyche lygdamus palosverdesensis) at the McGuire Center, Gainesville, Florida.

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A federally endangered Karner blue butterfly (Lycaeides melissa samuelis) in pupa form at the Toledo Zoo, Toledo, Ohio.

Photo: Julie Jensen Director of Marketing | WVC O: 866.800.7326 | D: 702.443.9249 | E: j.jensen@wvc.org

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