Migratory monarch butterflies entered the International Union of Conservation of Nature’s Red List of Threatened Species as ...

The major U.S. Fish and Wildlife Service’s proposal would declare the iconic species as threatened, with federal scientists saying the species is on the decline.

This year the organization counted 9,119 monarchs, the second-lowest total since tracking began in 1997. The organization has ...

Millions of western monarchs used to return to coastal California every year, but the population has plummeted in recent decades, and fewer than 2,000 butterflies were counted in California in 2020.