Juvenile, San Joaquin Marsh, Orange County, CA. 7-31-11. © John  C. Avise.

Semipalmated Sandpiper

Calidris pusilla

Charadriiformes: Scolopacidae

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Juvenile, San Joaquin Marsh, Orange County, CA. 7-31-11. © John  C. Avise.
Juvenile, San Joaquin Marsh, Orange County, CA. 7-31-11. © John  C. Avise.

Juvenile, San Joaquin Marsh, Orange County, CA. 7-31-11. © John  C. Avise.
Juvenile at the right (with a Western Sandpiper to the left). San 
Joaquin Marsh, Orange County, CA. 7-31-11. © John  C. Avise.

Flying (second from the left), with a flock of Western Sandpipers. © John  C. Avise.