Sylvain Cordier / Monarch butterfly (Danaus plexippus), wintering from November to March in Oyamel pine forests (Abies religiosa) Monarch Butterfly Biosphere Reserve, Mexico.
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Patricio Robles Gil / Monarch butterfly (Danaus plexippus) large groups of butterflies hanging from Oyamel branches, Sierra Chincua Sanctuary, Mexico.
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Patricio Robles Gil / Children visiting the Monarch butterfly reserve at Sierra Chincua Sanctuary, Mexico.
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Patricio Robles Gil / Children visiting Monarch butterfly reserve. Teacher and child looking at images of butterflies on mobile phone, Sierra Chincua Sanctuary, Mexico.
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Patricio Robles Gil / Children visiting the Monarch butterfly reserve at Sierra Chincua Sanctuary, Mexico.
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Patricio Robles Gil / Oyamel tree full of Monarch butterflies (Danaus plexippus) in fog, Sierra Chincua Sanctuary, Mexico.
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Patricio Robles Gil / Oyamel tree full of Monarch butterflies (Danaus plexippus) in fog, Sierra Chincua Sanctuary, Mexico.
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Patricio Robles Gil / School children and rangers visiting the Monarch Butterfly Reserve at Sierra Chincua Sanctuary, Mexico.
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Patricio Robles Gil / Logged tree trunks on the ground, Sierra Chincua Butterfly. Sanctuary, Mexico.
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Patricio Robles Gil / Monarch butterfly (Danaus plexippus) Sierra Chincua Sanctuary, Mexico.
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Patricio Robles Gil / Monarch Butterfly Biosphere Reserve Sign, Sierra Chincua Sanctuary, Mexico.
