Pine Warbler (Dendroica pinus)
Above and below two: A fairly bright Pine Warbler in Charles Co., Maryland (9/20/2008).
Below: A Pine Warbler on the drab extreme in Caroline Co., Maryland (9/21/2008).
Below: A Pine Warbler at Soldier's Delight, Baltimore Co., Maryland (9/13/2008).
Below two: A comparison of drab versus not-so-drab Pine Warblers in Wicomico Co., Maryland (8/26/2007).
Below: Photographed in a Queen Anne's County, Maryland (2/25/2005).
Below: Pine Warblers on Assateague Island, Maryland - second photo shows undertail pattern.