Monarch butterfly numbers in Mexico rise by 35%

Experts say the rise may reflect the butterflies’ ability to adapt to more extreme bouts of heat or drought by varying the date when they leave Mexico.

Each year the monarchs return to the United States and Canada on an annual migration that is threatened by loss of the milkweed they feed on north of the border, and deforestation in Mexico. The butterflies traditionally arrive in the mountaintop pine and fir forests west of Mexico City in late October and the start of November. They normally leave for the U.S. and Canada in March.

Tavera urged Mexicans not to plant milkweed in Mexico, saying it might disrupt the migration by encouraging monarchs to stick around, rather than leave for the north. She also urged people not to breed monarchs in captivity — they are sometimes released at weddings or other celebrations — saying that could spread diseases among the insects.

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