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Semipalmated Sandpiper or Sanderling? LI, NY (1 Viewer)

It's not a Sanderling, due to the patterned back and other minor details. It is either a Western or a Semipalmated Sandpiper. They are extremely similar in nonbreeding plumage, but my best guess is Semipalmated.
 
It's not a Sanderling, due to the patterned back and other minor details. It is either a Western or a Semipalmated Sandpiper. They are extremely similar in nonbreeding plumage, but my best guess is Semipalmated.

But... this bird isn't in non-breeding plumage. And Sanderlings have patterned mantles in breeding plumage.

EDIT: Originally was thinking female Sandering, but now I agree Semipalm after studying a bit. But again, the separation with Western in breeding plumage is pretty striking, and this bird is still in breeding plumage.
 
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