The Endangered Species Act is no help yet.

The hotter conditions produced more potent toxins in the milkweed. But the researchers said that surprisingly, the parasitic ...

California's wildlife conservation societies are urging people to come forward to help save these iconic pollinator species.

Mid-season surveys have turned up roughly 8,000 monarchs across the western range, based on figures compiled by count ...

In a new study, University of Georgia scientists found hotter temperatures make monarch butterflies more vulnerable to ...

Climate warming can impact plant quality, which in turn shapes the nutrition and immune defense of insect herbivores like ...

It is now the late season for butterflies in Goleta groves, and the picture is dismal. Only two butterflies were recorded in ...

The Western monarch population has plunged more than 95% since the 1980s, and has a more than 99% chance of extinction by 2080. Western monarchs primarily spend winters along the California coast.

Pacific Grove is known as ‘Butterfly Town USA’ for its role as an overwintering spot. As the insect’s population plummets, residents are coming to its rescue ...

The anecdotes abound this year — friends reporting magical clusters of monarch butterflies on their walks, dozens of organizations offering free giveaways of native milkweed and projects to restore ...

Monarch butterflies are well-known and beloved migratory pollinators in North America. NNehring via Getty Images For generations, monarch butterflies have traveled thousands of miles across North ...

I struggled to catch my breath, but it had nothing to do with the 10,000-foot altitude. All around me, millions of monarch ...