Monarch butterfly numbers are down by 80% overall and remain just one-third the size needed to avoid migratory collapse.

Monarch butterflies are in trouble, and when scientists report each new drop in overwintering monarch-butterfly populations, ... Then European settlers cleared forests and native prairies, ...

For example, the Washington Post announced that “Monarch butterflies, now endangered, are on the ‘edge of collapse’”, ... and they may be expanding into Europe and Africa.

The monarch butterfly's migration pattern takes it through Wisconsin annually, making it a familiar sight for residents ...

Monarch butterfly breeding populations have remained stable since 1993, a study published in Global Change Biology on Friday found, disputing previous concerns raised by scientists that the ...

A monarch butterfly makes a stop on a butterfly bush in a flower garden north of Durango on Aug. 25. Monarchs that overwinter in California and migrate to Colorado for the summer increased from a ...

Now the U.S. Fish and Wildlife Service is proposing to add the monarch butterfly (Danaus plexippus) to the nation's list of threatened and endangered species.

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.

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.

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.