While I have photographed many species of birds, warblers have consistently eluded me. However while watching rutting whitetails recently I noticed this unusual bird flitting about the underbrush. Focusing the camera on it I noted the similarity to birds I had photographed earlier during my Assateague Island visit. Checking references I have come to the conclusion that this bird is a male Yellow-rumped Warbler.
This image and the one following are the birds photographed at Assateague.
My guess is that either these are females or immature birds. Perhaps a more accomplished birder than I can offer some suggestions as to which is the case.