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Calidris sida.
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Semipalmated sandpiper Calidris pusilla

Very small shorebird
Short, thin, dark bill not obviously thinner at tip than at base
Dark legs
Thin, white wing stripe
Black line on rump extends onto tail
Sexes similar

Juvenile:
Black-based back feathers and wing coverts with white and gray edges
May have faint orangish wash to upperparts and breast
Faint, partial gray breast band
White underparts
Dark crown contrasts with pale supercilium

Western sandpiper Calidris mauri

Very small shorebird
Short, thin, dark bill thinner at tip than at base and often with a slight droop
Dark legs
Thin, white wing stripe
Black line on rump extends onto tail
Sexes similar

Juvenile:
Rufous scapulars
Black-based back feathers and wing coverts with white and gray edges
Faint, partial gray breast band
White underprts
Indistinct gray crown and pale supercilium

Beringsnipe, Calidris mauri

Gulbrystsnipe, Calidris bairdii
aug-97, Foto: Ruth Sullivan

Sandsnipe, Calidris pusilla, juv.
juli-97, Foto: Ruth Sullivan

Western Sandpiper Calidris mauri
This and the Least Sandpiper are the two common small "peeps" in most of the West (west of the Plains). The Western is the larger bird; its bill is very noticeably longer (especially in females), thicker at the base, and droops slightly at the tip. Legs black. Breeding adults are heavily streaked on the breast. They show rusty on the scapulars and have a rusty crown and ear patch. (A trace of rusty may persist on the scapulars in fall, giving a two-toned effect.) In winter, gray or gray-brown; perhaps the palest "peep."
Very similar to Semipalmated Sandpiper; but may be a trifle larger. In typical adult females the bill is definitely thicker at the base and longer, drooping slightly at the tip. Summer adults are rustier on the back and crown. Because of their shorter bills, many males in fall or winter plumage are almost impossible to separate from Semipalmateds except by voice. The latter species seldom winters in the United States, but the Western does. If the birds do not call, it is fairly safe to assume they are Westerns.

Dvergsnipe Calidris minuta

Langtåsnipe Calidris subminuta