Western Sandpiper

Also at the south jetty at Gray's Pass last April, Erika and I photographed this sandpiper. The bird in the photo appears to have an odd, square-shaped head. I am not sure what to make of that apparent abnormality. Because of the broad black spots and slight reddish edges on the scapulars, the relatively long bill (for a small sandpiper), and the black legs all lead me to identify this bird as a Western Sandpiper. Plus Western Sandpipers are "one  of the commonest shorebirds of the Western Hemisphere, wintering along the Pacific coast of North America and the south Atlantic coast" (Wilson 1994).