Ingo Arndt / Monarch (Danaus plexippus) butterflies gathering to drink water and take up minerals, Michoacan, Mexico
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Jack Dykinga / Monarch Butterflies (Danaus plexippus) covering the trunk of a coniferous tree, Sierra Chincua Monarch Butterfly Biosphere Reserve, Michoacan, Mexico, Central America
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Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, mass flying in wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico
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Thomas Mangelsen / Monarch (Danaus plexippus) butterfly group perching on a female tourist, El Rosario Monarch Butterfly Sanctuary, Mexico
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Tim Fitzharris / Monarch (Danaus plexippus) butterflies on lupine, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterfly group flying, during a warm day when the overwintering period draws to an end large numbers become active, Michoacan, Mexico
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Thomas Marent / Monarch (Danaus plexippus) butterflies roosting in trees at night, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterfly overwintering areas that have been destroyed by illegal logging, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterfly resting on flower in overwintering area, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies flying during a warm day, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies flying during a warm day, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies flying during a warm day, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies flying during a warm day, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies in overwintering colony, some of which are basking in the sun, Michoacan, Mexico
Ingo Arndt / Monarch (Danaus plexippus) butterfly basking in the midday sun, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies basking in the midday sun, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterfly cluster, some individuals are basking while most have their wings closed, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies with closed wings in overwintering colony, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterfly habitat restoration, man holding plants that will be used to replant areas of forest to re-establish overwintering sites, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterfly habitat restoration, man holding plants that will be used to replant areas of forest to re-establish overwintering sites, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterfly overwintering areas that have been destroyed by illegal logging, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies gathering to drink water and take up minerals, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies gathering to drink water and take up minerals, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterfly drinking water and taking up minerals, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies gathering to drink water and take up minerals, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies gathering to drink water and take up minerals, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies flying during a warm day, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterfly dead on the ground after wet and cold weather, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies dead on the ground after wet and cold weather, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies with closed wings in overwintering colony, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies with closed wings in overwintering colony, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterflies in trees, El Rosario, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterfly overwintering site in highland forest, Michoacan, Mexico
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Ingo Arndt / Monarch (Danaus plexippus) butterfly overwintering site in highland forest, Michoacan, Mexico
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Jack Dykinga / Monarch Butterflies (Danaus plexippus) covering the trunk of a tree in coniferous forest, Sierra Chincua Monarch Butterfly Biosphere Reserve, Michoacan, Mexico, Central America
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Jack Dykinga / Monarch Butterflies (Danaus plexippus) flying and landing on trees beneath a coniferous forest, Sierra Chincua Monarch Butterfly Biosphere Reserve, Michoacan, Mexico, Central America
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Jack Dykinga / Monarch Butterflies (Danaus plexippus) covering the trunk of a tree in coniferous forest, Sierra Chincua Monarch Butterfly Biosphere Reserve, Michoacan, Mexico, Central America
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Jack Dykinga / Monarch Butterflies (Danaus plexippus) clustering on trees in a coniferous forest, Sierra Chincua Monarch Butterfly Biosphere Reserve, Michoacan, Mexico, Central America
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Jack Dykinga / Monarch Butterflies (Danaus plexippus) on a tree trunk in coniferous forest, Sierra Chincua Monarch Butterfly Biosphere Reserve, Michoacan, Mexico, Central America
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Jack Dykinga / Monarch Butterflies (Danaus plexippus) in the trees of a coniferous forest, Sierra Chincua Monarch Butterfly Biosphere Reserve, Michoacan, Mexico, Central America
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Jack Dykinga / Dead Monarch Butterflies (Danaus plexippus) lying on the ground, killed by a January freeze. Sierra Chincua Monarch Butterfly Biosphere Reserve, Michoacan, Mexico, Central America
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Jack Dykinga / Monarch Butterflies (Danaus plexippus) flying and landing on plants beneath a coniferous forest, Sierra Chincua Monarch Butterfly Biosphere Reserve, Michoacan, Mexico, Central America
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Thomas Marent / Monarch (Danaus plexippus) butterfly cluster, Michoacan, Mexico
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Thomas Marent / Monarch (Danaus plexippus) butterfly cluster, Michoacan, Mexico
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Thomas Marent / Monarch (Danaus plexippus) butterfly cluster, Michoacan, Mexico
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Thomas Marent / Monarch (Danaus plexippus) butterfly cluster, Michoacan, Mexico
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Thomas Marent / Monarch (Danaus plexippus) butterfly cluster, Michoacan, Mexico
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Thomas Marent / Monarch (Danaus plexippus) butterfly colony, Michoacan, Mexico
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Thomas Marent / Monarch (Danaus plexippus) butterfly cluster, Michoacan, Mexico
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Thomas Marent / Temperate landscape, Michoacan, Mexico
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Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, drinking from pool in wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico
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Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, mass gathered in trees in wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico
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Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, mass gathered in trees in wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico
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Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, one on a flower stem in wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico
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Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, one on a flower stem in wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico
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Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, group backlit on tree in wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico
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Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, group on moss-covered tree in wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico
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Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, on moss-covered tree in wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico
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Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, group in a tree in their wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico
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Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, mass flying in their wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico
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Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, mass covering a tree trunk in their wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico
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Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, group on moss-covered tree in wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico
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Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, group backlit on tree in wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico
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Thomas Mangelsen / Monarch (Danaus plexippus) butterfly mass at wintering grounds, El Rosario Monarch Butterfly Sanctuary, Mexico
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Tim Fitzharris / Monarch (Danaus plexippus) butterflies on lupine, Michoacan, Mexico
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Ingo Arndt / Videographer Silke Arndt on location, Michoacan, Mexico
