Why
is this place so special for monarchs?
Millions and millions of monarchs migrating
to Mexico will spend the winter--together--in an astonishingly small
region. The butterflies gather and form tight, clustered colonies
in the region shown within the orange rectangle on this image. This
region is only 73 miles wide.
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Why here? What conditions do you think make the habitat in this region ideal for monarch survival? In this week's slideshow, find out what scientists are learning about the unique microclimate of the monarch overwintering region.
Image: NASA