Experts say 35% rise in acreage covered by migratory insects my reflect adaptation to changing climate
Mexican experts have said that 35% more monarch
butterflies arrived this year to spend the winter in mountaintop forests, compared with the previous season.
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.
The government commission for natural protected areas said the butterflies’ population covered 2.84 hectares (7 acres) this year, compared with 2.1 hectares last year.
The annual butterfly count does not calculate the individual number of butterflies, but rather the number of acres they cover when they clump together on tree boughs.