The Pacific Flyway is a major north-south flyway for migratory birds in America, extending from Alaska to Patagonia. Every year, migratory birds travel some or all of this distance both in spring and in fall, following food sources, heading to breeding grounds, or travelling to overwintering sites.
Any given bird species travels roughly the same route every year, at almost the same time. Ornithologists and "bird lovers" can often predict to the day when a particular species will show up in their area.
Along the Pacific Flyway, there are many key rest stops where birds of many species gather, sometimes in the millions, to feed and regain their strength before continuing. Some species may remain in these rest stops for the entire season, but most stay a few days before moving on.
- Notable locations include:
- Boundary Bay, British Columbia, has been listed as an Important Bird Area by the Canadian government in recognition of its value to migratory birds.
- Alaksen National Wildlife Area, on Westham Island off Richmond, British Columbia
- Vic Fazio Yolo Wildlife Area in the Yolo Bypass in the Central Valley of California is a protected area along the flyway.
- Klamath Basin National Wildlife Refuges Complex consists of several different wildlife refuges on the border of Oregon and California.
- The Summer Lake Wildlife Sanctuary, located on Hwy 31, across from the Summer Lake Lodge, in Oregon's southeastern high desert.
- Suisun Marsh, next to the exit of the inverted Sacramento-San Joaquin River Delta, has protected portions.
- San Francisco Bay, protected estuaries and mountain open space preserves.
- Coyote Valley, a semi-developed section of the Santa Clara Valley with one of the highest recorded bird species richness and nesting densities in the nation.
- Great Salt Lake, Utah, a Great Basin hub of flyway.
- Monterey Bay, protected estuaries and mountain open space preserves.
- Ballona Wetlands between the Los Angeles neighborhoods of Playa del Rey and Marina del Rey and adjacent city-owned lagoons.
- Salton Sea, an inland Colorado Desert saline endorheic lake in Southern California, hosts many birds and has surrounding wildlife refuges.
- San Diego Bay, which includes several areas designated as part of the [[San Diego National Wildlife Refuge Complex]
- Guerrero Negro Baja California Sur [Bird sanctuary] half way of the peninsula of Baja California Mexico
- San Jose Estuary San Jose del Cabo Baja California Sur,Mexico bird sanctuary and birding Los cabos
- List of Klamath Basin birds
- Important Bird Area
- Category: Ornithology in the United States
- Category: National Wildlife Refuges of the United States
- Robert M. Wilson. Seeking Refuge: Birds and Landscapes of the Pacific Flyway (University of Washington Press; 2010) 245 pages
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