The population of the eastern monarch butterflies in Mexico doubled this past winter season, according to a WWF survey.

The number of monarch butterflies overwintering this year in Mexico has nearly doubled, according to the 2025 annual census.

The population wintering in central Mexico's forests occupied 4.42 acres, up from 2.22 acres during the previous winter.

This year’s count of 4.42 acres of occupied forest habitat is nearly twice as large as last year's, but eastern monarch ...

What sounded like leaves rustling in the wind was the flickering wings of thousands of monarch butterflies as they flitted ...

The World Wildlife Fund's latest count of migratory monarch ... butterflies but tracks the population by measuring the area that the insects cover in the forests of Central Mexico during their ...