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The California gnatcatcher, Polioptila californica, is a little gray bird. Males are identifiable by their black cap (absent in winter), females by the slight brownish tinge of their plumage. Distinguishing the California gnatcatcher from the fifteen other species of gnatcatcher is easy, the ornithologist Jonathan Atwood told me “if you’re a gnatcatcher freak.” All the others are little gray birds, too. Scientists have divided Polioptila californica into several subspecies. The northernmost of these, the coastal California gnatcatcher ( Polioptila californica californica) lives along the western coast of the Baja Peninsula, from El Rosario, Mexico, north to Long Beach a range that includes some of the choicest undeveloped real estate in southern California. When the U.S. Fish and Wildlife Service listed the subspecies as threatened under the Endangered Species Act in 1993, the region’s ranchers and developers were furious. The listing would cost them more than $900 mill

United statesLong beachBaja californiaDel rosarioUniversity of california at berkeleyErnst mayrHolly doremusRobert zinkYa wei liArthur shapiroScott thomsonDamien schiffCharles besseyJonathan atwoodDean amadonEnvironmental policy innovation center