Seriously threatened birds that share the same South Bay habitat include the Snowy Plover and California Least Tern, while less-threatened birds including Black-necked Stilts, American Avocets, Forster's Terns, and Caspian Terns are also preyed upon by the abnormally large flocks of California Gulls.
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National Geographic Society (2002): Field Guide to the Birds of North America.
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There are two subspecies recognized, the nominate from the Great Basin to central Montana and Wyoming, and the slightly larger, paler L. c. albertaensis with a more northerly distribution, ranging from Great Slave Lake onto the Great Plains of western Manitoba and South Dakota.
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