The population wintering in central Mexico's forests occupied 4.42 acres, up from 2.22 acres during the previous winter.
A Pennsylvania butterfly farmer says listing the monarch as a threatened species could do more harm than good.
WASHINGTON— The annual count of migratory monarchs who spend the winter in Mexico was released today and shows that the ...
The number of monarch butterflies wintering in the mountains west of Mexico City, rebounded this year, doubling the area they ...
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