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

A Pennsylvania butterfly farmer says listing the monarch as a threatened species could do more harm than good.

A network of advocates is doing everything they can to mitigate the dangers and unravel mysteries about monarch movements and ...

However, in late 2023, the butterfly’s status was reassessed and listed instead as vulnerable. This change in terminology came not from an increase in monarch numbers, but from a shift in the ...

The first countrywide systematic analysis of butterfly abundance found that the number of butterflies in the Lower 48 states has been falling on average 1.3% a year since the turn of the century, with ...

Adding that the lack of water weakens the trees meaning more pests, more disease and fewer monarch butterflies ... countrywide systematic analysis of butterfly abundance found that the number ...