In a new study, scientists pulled from a 35-year dataset to examine long-term population trends of the federally endangered ...

The number of monarch butterflies spending winter in the western U.S. dropped dramatically this year, despite moves to extend ...

The Western population of the monarch butterfly has declined to a near-record low with fewer than 10,000 found living in ...

The natural phenomenon of the iconic monarch butterflies migrating south for the winter is a fascinating one - and it's one ...

The number of monarch butterflies in California is in sharp decline this year. This is the second-lowest population recording ...

Once, millions of monarchs wintered in California. But climate change, habitat loss, widespread pesticide use and disease ...

Just over 9,000 monarchs were counted in California last winter, the second lowest ever since the annual count began in 1997 ...

Not that long ago, monarch butterflies would migrate in droves. However, over the last few decades, the number of these ...

The number of monarch butterflies spending the winter in the western United States dropped dramatically this year even as ...

Hundreds of volunteers and partners participated in the 28th annual Western Monarch Count by attempting to identify all of ...