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NATIONAL POST ONLINE | News story A severe winter storm in the mountains of central Mexico has virtually wiped out two colonies of monarch butterflies that make up Canada's entire breeding stock, an event that could have repercussions for the species here.
"It was really macabre," said Dr. Lincoln P. Brower, a butterfly biologist who estimated that between 220 million and 270 million frozen butterflies rained down from their roosts in the trees in mountains west of Mexico City.
Dead monarch butterflies lay in piles on the ground, he said, in some places more than a foot high. "I've been going down there for 25 years and I've never seen anything like it."