Eastern monarch butterfly numbers in Mexico have nearly doubled since last 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 ...
America’s butterflies are disappearing at a ‘catastrophic’ rate
US butterfly populations are declining because of insecticides, climate change and habitat loss, with the number of the ...
Monarch butterflies wintering in Mexico rebound this year
Monarchs from east of the Rocky Mountains in the United States and Canada overwinter in the mountains west of Mexico City.
World Wildlife Fund (WWF)5d
Eastern monarch butterfly population nearly doubles in 2025
The population wintering in central Mexico's forests occupied 4.42 acres, up from 2.22 acres during the previous winter.