As the climate warms, many species are shifting northward into areas that were previously too cold for them. A study, ...

Butterfly species numbers dropped 22% across the U.S. between 2000 and 2020. Habitat loss, climate change, pesticides are the main causes.

SAN FRANCISCO – Each year, millions of majestic orange and black monarch butterflies make an extreme, multi-generational 3,000 mile migration across the United States, flocking to wintering ...

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.

Taylor's checkerspot butterfly was declared a federally endangered species in 2013 and currently has 11 populations in western Washington, one in British Columbia, and two in Oregon's Willamette ...