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|Semipalmated Sandpiper (Calidris pusilla) Sandpipers and Allies (Scolopacidae)|
|Tyknæbbet Dværgryle Playero Semipalmeado|
2009-04-29 Las Coloradas, Yucatán (Yuc), Mexico
Transition to alternate plumage.
2009-08-23 Presa La Colorada, El Llano, Aguascalientes (Agu), Mexico
Juvenile. The short thick bill excludes Western Sandpiper (Calidris mauri), but also the brown-striped crown, the brownish ear coverts as well as a general cool browish expression indicates SS. Juvenile with the bright feather edges on shoulder and coverts and a uniform pattern. First record for Ags.