This is a light-footed clapper rail:
The light-footed clapper rail (Rallus longirostris levipes) is found exclusively in salt marshes between Santa Barbara, California and San Quintin Bay, Baja California, Mexico. Nesting occurs primarily in dense cordgrass, wrack deposits, and in hummocks of high marsh within the low marsh zone.The species was listed as endangered in 1970.
What I can add to this is they make a clappy noise and they usually come about at low tide.
This is a small stream that runs thru the Tijuana Estuary. Imperial Beach, California
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