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

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

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

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

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

Monarch butterflies in the western U.S. have dropped to just 9,119 this year. In 2023, the count was 233,394, meaning a 96% decline.

We know small populations are especially vulnerable to environmental fluctuations, and we think that’s what happened this ...

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

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

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

A 2,000-mile migration was thought to be a “foolish ... the USFWS issued a December 2024 proposal to list the monarch butterfly as a threatened species under the Endangered Species Act.

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