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MEXICO CITY — Authorities who have struggled to stop illegal logging in a famed monarch butterfly reserve are cutting down thousands of trees to fight an unprecedented infestation of deadly bark beetles.
Biologists and park workers are racing to fell as many as 9,000 infected fir trees and bury or extract infested wood before the orange-and-black monarchs start arriving in late October to spend the winter bunched together on branches, carpeting the trees.
