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Monarch Butterfly Natural Preserve The park's Monarch Grove provides a temporary home for up to 100,000 Monarchs each winter. From roughly mid-October through mid-February, the Monarchs form a "city in the trees." The area's mild ocean air and eucalyptus grove provide a safe roost until spring. In the spring and summer, the butterflies live in the valley regions west of the Rocky Mountains where milkweed, the only plant a Monarch caterpillar eats, is plentiful. Monarch migration is variable, and numbers vary each year.
MEXICO CITY (AP) — Deforestation in the wintering grounds of the Monarch butterfly in central Mexico has dropped to just over one acre's worth of trees, compared to the hundreds of acres lost annually in the past, experts said Thursday.
And fewer of the pine and fir trees that shelter the butterflies have been lost to bad weather this year, according to a report by researchers from Mexico's National Autonomous University and the Monarch Fund.
Illegal logging in the protected butterfly reserve dropped from 1.56 hectares in the 2009 winter season to just under a half hectare (about one acre) in the reserve's core zone during this year's winter.
"This is what happens when you have enforcement of the law, and economic alternatives for the inhabitants," said Omar Vidal, whose environmental group, the Worldwide Fund for Nature, has contributed along with cellphone company Telcel to economic development projects like tree nurseries in the reserve.