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

Colin Williams, from BBOWT, said the discovery of 43 eggs - an increase of 33% on 2022 - was a "positive result". Brown ...

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 ...

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

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