April 20, 1999 – The U.S. Fish and Wildlife Service listed the Sierra Nevada bighorn sheep as endangered under the Endangered Species Act on an emergency basis.
January 3, 2000 – The Service found that the Sierra Nevada bighorn constituted a distinct population segment and published a final rule listing the species as endangered on a permanent basis.
December 8, 2005 – The Center sued the Service for its failure to designate critical habitat for the sheep.
July 25, 2007 – The Service proposed designating 417,577 acres of critical habitat for the bighorn sheep. A final decision was set to be due on July 17, 2008.
September 24, 2007 – The Service published a recovery plan for the sheep.
February 2008 – The Service announced the publication of a recovery plan for the Sierra Nevada bighorn sheep. The agency also announced the availability of the draft economic analysis for the species’ critical habitat designation and re-opened the critical habitat comment period until March 6, 2008.
September 9, 2008 – A coalition of conservation groups, including the Center, filed suit against the Bush administration over weak forest-management plans that threaten wildlife in 10 Sierra Nevada national forests, including the Sierra Nevada bighorn sheep.
April 15, 2009 – The Center and Public Employees for Responsibility notified the Fish and Wildlife Service we’d sue if it did not take steps to protect the Sierra Nevada bighorn from disease transmitted from domestic sheep on sheep allotments in Mono County.
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