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

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

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

This winter, volunteers from the Xerces Society, a nonprofit environmental group, tallied just 9,119 western monarchs — a ...

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

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

The results of the 28 annual mid-season Western Monarch Count have been released: only 9,119 of the butterflies were counted ...

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

Overwintering populations of monarch butterflies in California have reached a near all-time low since records began, conservationists announced on Thursday. The ...

The monarch butterfly population spending the winter in the western United States has declined to its second-lowest level in nearly three decades.