Page "San Francisco Bay" Paragraph 17
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Wikipedia
Most famously, the bay is a key link in the Pacific Flyway.
Millions of waterfowl annually use the bay shallows as a refuge.
Two endangered species of birds are found here: the California least tern and the California clapper rail.
Exposed bay muds provide important feeding areas for shorebirds, but underlying layers of bay mud pose geological hazards for structures near many parts of the bay perimeter.
San Francisco Bay provided the nation's first wildlife refuge, Oakland's artificial Lake Merritt, constructed in the 1860s, and America's first urban National Wildlife Refuge, the Don Edwards San Francisco Bay National Wildlife Refuge ( SFBNWR ) in 1972.
The Bay is also plagued by non-native species.
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