Climate warming reduces nectar quality in flowers, leaving migrating monarch butterflies with less energy to survive winter.

The Endangered Species Act is no help yet.

Monarch butterflies have always been remarkably resilient. Every fall, these delicate orange-and-black travelers set out on a journey so improbable it borders on myth, flying some three thousand ...

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

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

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

PACIFIC GROVE — Pacific Grove is an idyllic place to go for rest and relaxation. West Coast Monarch butterflies would agree.

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

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

It’s a sunny July afternoon, and Grayslake neighbors Annie Lawson and Heather Bauer are standing at the side of Lawson’s home, carefully going through her garden of milkweed plants. Lawson points at ...

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 ...

Why Do Monarch Butterflies Swarm? Monarch butterflies, like other butterfly species and birds, must migrate to warmer climates during the cold winter months. Monarch butterflies are unique because ...