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Monarch Butterfly Migration Map

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Population Count is in...
Mexican officials have announced the size of this year's population. What do the results mean for monarch recovery efforts? More...

Monarch Butterflies at El Rosario Sanctuary in Mexico
A single sanctuary — El Rosario — contains 40% of this winter's population..
Image Estela Romero


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Report your sightings each fall and spring as the monarchs travel to and from Mexico.
Track migration on real-time migration maps. Help scientists learn more about monarchs.

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Spring Migration 2017
February - June

Watch this season's story unfold.
Monarch Butterfly Caterpillar on Milkweed
Monarch butterfly migration Monarch butterfly migration
Overwintering in Mexico
January 2017
Seeing Winter Monarchs?
January 24, 2017
Get Ready for
Spring Migration

February - June
Monarch butterfly migration Monarch Butterflies at El Rosario Sanctuary in Mexico  
Visiting a Sanctuary
February 9, 2017
Population Count is in...
February 16, 2017

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