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Monarch butterfly die off deepens Mexico migration mystery
Researchers estimate 150 million to 250 million monarchs froze to death in mid January cold snaps, doubling prior totals and challenging estimates of those that arrive. Lincoln Brower and Roberto Solis note high death rates at five mountain sanctuaries, with 80 percent dying at these sites.
MENTIONED IN THIS ARTICLE
Mexico
Mexico City
Lincoln Brower
United States
Canada
Michoacan
Power
Roberto Solis
Solis
Brower