Dec 26th 2013, 19:00, by Sarah Zhang
On highway medians, atop old landfills, in backyards—these are some of the places a monarch butterfly revival could begin. The yearly migration of monarchs from the northern U.S. and Canada to the warmer environs of Mexico was once a spectacular sight, and a now a rare one. Their numbers have dwindled. There's no single cause, but a major one is habitat loss.
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