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The California least tern (Sternula antillarum browni) is a subspecies of least tern that breeds primarily in bays of the Pacific Ocean within a very limited range of Southern California, in San Francisco Bay and in northern regions of Mexico. This migratory bird is a U.S. federally listed endangered subspecies. The total population of the ...
In 2014, a Bay Area-wide survey found osprey had extended their breeding range southward with nesting sites as far south as Hunters Point in San Francisco on the west side and Hayward on the east side, while further studies have found nesting sites as far south as the Los Gatos Creek watershed, indicating that the nesting range now includes the ...
California Coast Ranges from San Mateo County and SE Alameda County to SW Ventura County. Aphelocoma californica obscura Anthony, 1889: Belding's scrub jay: Smaller and darker than californica, with more intense purplish and brown coloration on head and back, respectively; prominent gray streaking on throat and distinct breast collar. Belly ...
The island hosts the San Francisco Bay’s largest nesting colony of Caspian terns. The terns are relatively recent arrivals, first recorded in the south bay in 1922 and nesting on Brooks Island since around 1980. They now occupy much of the man-made sandspit that stretches 2 miles (3.2 km) west from the north side of the island.
These California gulls now inhabit large, remote salt-production ponds and levees and have a very large food source provided by nearby landfills from San Francisco, San Jose and other urban areas, all the way up into the Sacramento area. The South Bay California gull population has grown from less than 1,000 breeding birds in 1982 to over ...
In adult plumage, The largest western gull colony is on the Farallon Islands, located about 26 mi (40 km) west of San Francisco, California; [7] an estimated 30,000 gulls live in the San Francisco Bay area. Western gulls also live in the Oregon Coast. [8] Two subspecies are recognized, differentiated by the mantle and eye colouration. [9]
The western population, the California least tern, was listed as an endangered species in 1972 with a population of about 600 pairs.With aggressive management, mainly by the exclusion of humans via fencing, the Californian population has rebounded in recent years to about 4500 pairs, a marked increase from 582 pairs in 1974 when census work began, though it is still listed as an endangered ...
Ridgway's rail (Rallus obsoletus) is a species of bird found principally along the Pacific coast of North America from the San Francisco Bay Area to southern Baja California, as well as in some regions of the Gulf of California. A member of the rail family, Rallidae, it is a chicken-sized bird that lives brackish tidal marshes and rarely flies.