Thank you, ISv! Most of my current bird photos, including this one, are taken in Qatar, where I'm based now. These birds are here all year roundI don't think it's Dunlin. Not Sanderling or Semipalmated sandpiper too (the forth thumb is clearly visible - Sanderlings are missing that one. In the Semipalmated we have to see some connection between the thumbs, I don't see it ...). I will try to ID it when I get home but since it looks like one of the "pips" I may fail - these are notoriously difficult... It may help somewhat if you tell us where you took that photo. Nice shot anyway!