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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