Monarch butterflies are noxious to potential predators because of the cardenolide toxins lacing their bodies, courtesy of the milkweed plants they fed on as larvae. Viceroy butterflies have no such ...

Each year, monarch butterflies migrate from North America to overwinter in Mexico, seeking some heat and sunshine in the south, and who can blame them? This 3,000-mile journey is one of the great ...

The Queen, while not as colorful or showy as its close relative, the Monarch, has its own distinctive beauty.

As David Ono's daughter Kaia demonstrates, anyone can play a role in protecting the monarch butterfly, a majestic but diminishing species that migrates through California.

U.S. officials moved Tuesday to protect the monarch, an iconic orange-and-black butterfly famous for its marathon migration across North America, under the Endangered Species Act.

Mimicry is one type of camouflage that is used by one small species of butterfly that occurs in our great state.

A proposed bill would make seed sharing of milkweed and other native plants legal. That could in turn boost monarch butterfly populations in the state.

The U.S. Fish and Wildlife Service proposed listing the monarch butterfly as a threatened species on Tuesday, citing a significant decline in the iconic black and orange insects that has pushed ...

There's nothing quite like seeing a monarch butterfly spread its wings and glide through the air. It can certainly provide a sense of calm to life's everyday stressors. But the monarchs' numbers ...

Monarch butterflies with more white spots on their mostly orange-and-black wings are more successful at long-distance migration. Some scientists think the spots may affect airflow around their wings.

Monarch butterfly populations are crashing — but we can choose to do something about it A species once numbering in the millions has reached 5% of its population in the '80s. We can reverse this ...

In the summer of 2011, a small band of Ontario scientists set out to perform the most ambitious survey ever attempted of the imperiled monarch butterfly. Leading the fieldwork was Tyler Flockhart ...