Well, I just returned from looking for the Warbler, without any luck. I searched the trees around that building, and another birder thought that she was hearing a warbler "chip", but we didn't see it. What we DID see in one of those trees was a Cooper's Hawk eating a bird. We checked the ground under the tree after it left, there were some small grey feathers with a couple that had some yellow bits on them. Not conclusive as to what it was, but SOMEBODY got eaten for breakfast.
with regrets -
Jeff Parks
Boulder, CO