March 11, 1967 – The U.S. Fish and Wildlife Service listed the Cape Sable seaside sparrow as endangered under the Endangered Species Act.
August 11, 1977 – The Service designated approximately 197,260 acres of critical habitat for the sparrow.
October 31, 2006 – The Service proposed to revise its 1977 critical habitat designation to include only about 84,865 acres.
November 7, 2007 – The Fish and Wildlife Service published a final rule illegally reducing the Cape Sable seaside sparrow's critical habitat from about 197,260 acres to just 84,865.
August 13, 2013 – The Center and noted scientist Dr. Stuart Pimm filed a formal notice of intent to sue the Army Corps of Engineers and U.S. Fish and Wildlife Service over continued flooding of habitat for the endangered Cape Sable seaside sparrow and Everglades National Park.