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.
ZME Science on MSN4d
A Shocking 22% of Butterflies in the U.S. Have Vanished in Just Two DecadesA sweeping new study reveals that butterfly populations across the continental United States have plummeted by 22% over the ...
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