The number of monarch butterflies spending the winter in the western United States has dropped to its second-lowest mark in ...

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

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

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

The Western population of the monarch butterfly hit a near-record low with fewer than 10,000 found living in California this ...

Thogmartin and other researchers have evaluated more than 200 scenarios for restoring greater than 1.3 billion stems of ...

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

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