On Saturday, Sept 8, I went to Nonquon Sewage Lagoons, near Port Perry, in search of Shorebirds; instead I found myself in the middle of a Fall warbler fallout - saw hundreds of hungry warblers feasting on the bugs among tree leaves on the north side of the lagoons. I identified about dozen or so species of warblers; however, this one still eludes me. Any idea what this could be? This is the only photo I got. I was leaning towards an American Redstart; however, the underside of the tail doesn't look quite right. Thanks in advance.