Quite often it doesn’t require a real crisp picture to demonstrate the field marks of a species. Just looking at the bill almost clinches the id of this Semipalmated Sandpiper. Thick at the base, short, straight and blob-tipped. The breast is nicely streaked which hints of this bird being an adult. This bird was photographed at Fernhill Wetlands on 7/20/10.
The next set with 2 different birds is from Bayocean Spit near Tillamook, OR. Taken on 7/25/10 at high tide.
These are juvenile Semipalmated Sandpipers since there is essentially no streaking on the breast. The semipalmated (half-webbed) feet can be seen well. The legs are partially olive, another trait of the juvenile bird molting into winter plumage. The streaking on the back is crisp and there is a little buff color in the fringes. The supercilium is clearly defined on all birds.