Utah Birds
Photo Quiz Answer
  

  
      Quiz # 001  (June 2010)
  

  
  

 

  
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For this quiz we know the bird is a shorebird (if it wasnít obvious in the photo I told you it was also).  That is out starting point.  The position of the bird doesnít allow us to see the head or breast, but we have still have enough good field marks to get a positive ID.

The posture of this bird gives us a great look at the legs so letís start there.  Judging size can be tricky in photos, but this bird appears to have relatively short, black legs.  Some plovers also may have black, short legs, but our bird has reddish feathers on the back and a clean, white breast with spotting down the side.  That eliminates all the plovers.

That still leaves us with about 20 species to choose from.  The black legs alone eliminate a few species.  The 2 Dowitchers, Ruddy Turnstone, Pectoral, Sharp-tailed, and Least Sandpipers, and others all have yellow or greenish legs.

Now that we have narrowed the field, letís take a closer look at other field marks.  Many of you mentioned the bill.  We donít have a clear view of it, but it appears to be all black and a little long.  It also appears to be somewhat tapered and may turn down a bit near the end.  This probably pointed most of you toward a Western Sandpiper, but bill length and shape is variable and even with a good look can be a bit tricky.  It is a good idea to look at other field marks as well.

Given that, letís take a closer look at the plumage.  The bright colors on the back, the clean white breast with crisp black spotting along the sides points to a bird in breeding plumage.   That helps Ė non-breeding are even trickier.

Looking closely at the plumage we can start eliminating some species .  A Sanderling doesnít have streaking down the sides like this bird.  The amount of red or rufous in the back eliminates Bairdís and White-rumped Sandpipers.  Even if this bird was in a transitional stage and not in full breeding plumage a Red Knot should show some rufous on the belly, and a Dunlin would show at least some black.  A closer look at the red feathers on the back would eliminate both of these as well (see below). 

Unless I am forgetting anything I think we are left with Western Sandpiper and Semipalmated Sandpiper.  Typically the bill on a Semipalmated is shorter and straighter than a Western.  As mentioned above, our birdís bill looks like a that of a Western.  Semipalmated Sandpipers normally donít have as much red in the back and normally show less streaking on the sides, but again this can be somewhat variable.  A close look at the reddish feathers on the back are conclusive.  The feathers on a Semipalmated are mostly black in the center with a rufous edge.  The Western Sandpiper has feathers that are rufous at the base and center with black towards the end, all of which is surrounded by a white edge (if you own Shorebirds: an identification Guide it shows a drawing of this pattern on plate 75).  The angle of our photo shows gives us a great look at this pattern and eliminates all doubt about our ID.

I photographed this WESTERN SANDPIPER on May 6, 2010 at Lincoln Beach, Utah.
  

 

  
Correct Answers (in order received):
  1. Milt Moody
  2. Jeffrey Saffle
  3. Ryan OíDonnell
  4. Mark Stackhouse
  5. Oliver Hansen
  6. Jon Watkins
  7. Casey Day
  8. Joey Foote
  9. Eric Huish
  10. Jerry Liguori
  11. J. Shirley
  12. Bill Fenimore
  13. Joey Foote
  14. Martha Happ
  15. Melanie Hoffman
  16. Sylvia Gray
  17. Pat Jividen
  18. Steve Carr
  19. Keeli Marvel
  20. Lee Jones
  21. Yvonne Carter
  22. Tom Williams
  23. Darren Shirley
  24. Dennis Shirley
  25. Brian Neilsen

78% of all answers were correct.