Well, once again Christian Nunes was able to provide key information to 
distinguish whether these were Common Terns or Forster's Terns.  The bills 
and legs were orange, rather than a darker orange-red, which indicates 
Forster's Terns.  I had to go take another look, the sun was out this time, 
giving a good look at colors.  Earlier there was a bit of overcast, I 
thought they had black bills at first, but then realized that they were 
reddish (orange, actually) with a black tip.  I was also going by the 
primary feather color in Sibley, which showed a much lighter color on the 
Forster's than on the Commons. 
 
Anyway, three Forster's terns were still sitting on buoy balls in the 
middle of the reservoir as of 4:15 pm, hopefully they will hang around 
awhile for other folks to get a look.  Sorry for the false alarm -

>
> Happy birding -
>
> Jeff Parks
> Boulder, CO
>

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