For example, in the U.K., gardening practices that diminished the red ant population had an outsized impact on the endangered large blue butterfly (Phengaris arion).

The Fender's blue butterfly is found only in Oregon's Willamette Valley -- a 150-mile long region in the state that stretches from Portland to Eugene -- says the service.

The monarch butterfly (Danaus plexippus) is renowned for its black-and-orange beauty and its spectacular migration of ...

The monarch butterfly is widely recognized and widely dispersed across North America and it's in trouble. Federal officials decide soon whether it gets protection under the Endangered Species Act.

The International Union for Conservation of Nature placed the monarch butterfly on its Red List of Threatened Species as endangered in July, but despite decades of declining numbers, the delicate ...

Though monarch butterfly eggs are small and hidden on the undersides of leaves, they are still at risk of being eaten. The black-headed grosbeak is a well-known predator of monarch butterflies and ...

Monarch butterflies hanging from tree branches 60 Minutes Anderson Cooper: There're so many of them on the branches of the trees, the-- the-- the branches are all pointing toward the ground.

Scientists have revealed the development of a cryopreservation technique for "the successful long-term storage of monarch butterfly germ plasm" to repopulate the pollinator in the event of a ...

Zoo New York in Watertown, NY hosted its annual monarch butterfly release on Thursday. The annual event releases the ...