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 has dropped to its second-lowest mark in ...

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

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

In 2023, more than 16,000 butterflies were counted at one local grove. The most recent count was a tiny fraction of that.

For 28 years, the Xerces Society for Invertebrate Conservation has counted monarch overwinter populations along the ...

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

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

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

On Thursday, invertebrate conservation group the Xerxes Society released the results of their 28th annual Western Monarch ...

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