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

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 ...