May 6, 1991 – The U.S. Fish and Wildlife Service received a petition from the International Council for Bird Preservation to list the black-breasted puffleg.
December 16, 1991 – The Service made a positive 90-day finding on the petition.
March 28, 1994 – The Service published a 12-month finding on the 1991 petition, determining that the black-breasted puffleg warranted listing but that protection was precluded by other listing priorities.
January 23, 2008 – As a result of a lawsuit brought by the Center, the U.S. District Court for the Northern District of California found that the Fish and Wildlife Service had violated the Endangered Species Act by failing to adequately heed the puffleg’s plight. The court ordered the Service to propose a listing rule for the black-breasted puffleg by the end of 2008.