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As Susan, Mariel, Joyce and I were crossing the east causeway on Rt.  
T near the campground at Thomas Hill Reservoir Sunday, our attention  
was drawn to a swirling flock of birds fairly low over the water to  
the north.

About 50 birds
Flashed All White when turned--could get no markings
When flock crossed to south side, sun was behind them and gave us  
only silhouettes
Tails variously described by us as slight notched vee or shallowly  
concave
Overall conformation reminded me strongly of Purple Martins
Flight was similar to martins, too--not fluttery like Black Terns
Size, relative to the ring-bills, was much smaller--Black Terns came  
to mind, but did not fit for several reasons.

So--we all felt that Least Terns seemed the most likely, BUT, 50 in a  
flock was beyond our experience.

Thoughts?

Edge Wade
Columbia, MO
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