Mr. Estabrook, We just left the Discovery Center a couple of hours ago and saw a Great Crested Flycatcher which is our first time to see one there. I didn't really think it matched your description, but it was the only Flycatcher we saw (besides an Eastern Kingbird). I just wondered if it was possible that you may have seen the GC Flycatcher. It was to the right hand side of the boardwalk as you are facing the tower where the fork is. We also saw the Eurasian Collared Doves you mentioned seeing there which was a first for us as well as an otter who was on the boardwalk and NOT in the water...another first! Good birding, Chloe Walker