The latest example comes from California, where the western monarch butterfly population has absolutely plummeted over just a few years, and it’s getting worse. In fact, the population of the ...

Western monarch butterflies migrate from Arizona, Nevada, Oregon, Washington, Idaho, Utah and inland California to coastal California to stay warm and conserve energy during the winter ...

With the recent proposed listing of the monarch butterfly under the Endangered ... We know this is a problem. Research in California’s Central Valley by the Xerces Society and University of ...

The number of western monarch butterflies overwintering in California dropped by 30% last year, likely due to how wet it was, researchers said Tuesday. Volunteers who visited sites in California ...