WildEarth Guardians

WildEarth Guardians is a non-profit grassroots environmental organization best known for its decade-long legal action against the US Fish and Wildlife Service, which culminated in 2011 with the Fish and Wildlife Service agreeing to move forward with protection for more than 800 species under the Endangered Species Act.WildEarth Guardians operates primarily in the Rocky Mountain region of the United States, Canada, and Mexico, and in the Pacific Northwest. As of January 2015, WildEarth Guardians has over 67,000 members.

Source: Wikipedia