The population wintering in central Mexico's forests occupied 4.42 acres, up from 2.22 acres during the previous winter.
US butterfly populations are declining because of insecticides, climate change and habitat loss, with the number of the winged beauties down 22% since 2000, a new nationwide study finds.
The monarch butterfly is one of many insects threatened by human-caused means, but Monarch Watch may have a solution.
A Pennsylvania butterfly farmer says listing the monarch as a threatened species could do more harm than good.
PISMO BEACH, Calif. (CN) — In a small tree grove at the south end of Pismo Beach on California's Central Coast, one visitor has arrived with a long telephoto lens while others take photos with their smartphones or simply stare up at the trees.
A study, published Thursday in the journal Science, found that 22% of butterflies in the United States disappeared between 2000 and 2020.
Mexican officials and environmental groups say better weather conditions on the butterflies’ migration route caused the uptick. But they warn population totals are still well below average.