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

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

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

The U.S. Fish and Wildlife Service is taking steps to list monarch butterflies as threatened species and designate seven ...

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

“Insect populations commonly fluctuate from year to year,” according to the California ... The monarch butterfly was first petitioned to be listed under the federal Endangered Species Act ...

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 ...

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

California and other West states ... the U.S. Fish and Wildlife Service proposed to list the monarch butterfly as a threatened species under the U.S. Endangered Species Act.

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

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