Monarch butterfly numbers drop by 27 percent in Mexico

Source: Associated Press

Monarch butterfly numbers drop by 27 percent in Mexico

By MARK STEVENSON
Feb. 9, 2017 12:18 PM EST

MEXICO CITY (AP) — The number of monarch butterflies wintering in Mexico dropped by 27 percent this year, reversing last year's recovery from historically low numbers, according to a study by government and independent experts released Thursday.

The experts say the decline could be due to late winter storms last year that blew down more than 100 acres (40 hectares) of forests where migrating monarch butterflies spend the winter in central Mexico.

Millions of monarchs make the 3,400-mile (5,500-kilometer) migration from the United States and Canada each year, and they cluster tightly in the pine and fir forests west of Mexico City. They are counted not by individuals, but by the area they cover.

"The reduction in the area of forest they occupied this year is most probably due to the high mortality caused by storms and cold weather last year," said Omar Vidal, the head of the Mexico office of the World Wildlife Fund. "It is a clear reminder for the three countries that they must step up actions to protect breeding, feeding and migratory habitat."

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