It is used annually by 16 million shorebirds, including the world's entire population of western sandpipers.

Differential migration in Western Sandpipers with respect to body size and wing length.

He takes people to the delta to watch masses of western sandpipers that have migrated north from winter havens in Central and South America.

Commonly observed species include greater and lesser yellowlegs, long-billed dowitchers, dunlins, western sandpipers, Wilson's plovers, killdeer and willets.

Migrants include, Lesser Snow Geese, Greater and Lesser Yellowlegs, Long-billed Dowitchers, and Western Sandpipers.

The Nature Conservancy, which usually buys land to shield it from development, is renting land from the three farmers on behalf of migrating Western sandpipers, black-bellied plovers, dunlins, marbled godwits and other shorebirds.

Large flocks of Dunlin, Long-billed Dowitchers, Least Sandpipers and Western Sandpipers can be found feeding in shallow seasonal wetlands, whereas flocks of Long-billed Curlews are found using both wetlands and grasslands.