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

The monarch butterfly is one of many insects threatened by human-caused means, but Monarch Watch may have a solution.

The monarch butterfly population has rebounded from a near record low number in 2024, according to the latest annual survey ...

A federal plan to protect monarch butterfly habitat provides broad carveouts for farming practices. The U.S. Fish and ...

A new study has found that overall butterfly populations are declining across the United States. The study, which was ...

A study, published Thursday in the journal Science, found that 22% of butterflies in the United States disappeared between ...

Public comments on the proposed Endangered Species Act listing for monarch butterflies are open until until March 12.

Mexican officials and environmental groups say better weather conditions on the butterflies’ migration route caused the ...