Photo of the Day
Monarch butterflies
November 1, 2010
Monarch Butterflies, Mexico
This Month in Photo of the Day: Animal Migration Photos
Millions of monarch butterflies travel to ancestral winter roosts in Mexico's shrinking mountain fir forests. Surfing winds from southern Canada and the northern U.S., they travel thousands of miles, taking directional cues from the sun.
See more photos from the November 2010 story "Great Migrations."
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