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 spending the winter in the western United States dropped dramatically this year even as ...

Each year, millions of monarch butterflies travel thousands of miles across North America to escape the cold and find ...

Newly released data shows that the number of monarch butterflies migrating to California this winter is near-record low. "We ...

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 ...

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

A winter count of visiting monarch butterflies found a steep drop from previous years, which has scientists worried about the ...

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

The findings challenge previous assumptions about butterfly migration and highlight the role of phenotypic plasticity.

Scientists are grappling with a stark population decline of the western monarch butterfly after the species’ numbers hit a ...

On Tuesday, the Butterfly Pavilion in Westminster and the Government of Mexico are joining forces to protect one of North ...