I saw a Blue-winged Warbler along the Gwynns Falls Trail in Baltimore City's Carroll Park today (4/26). It was where the trail crosses the stream about 1/4 mile above the parking lot.  Other birds seen or heard along the trail were a pair of Wood Ducks, Spotted Sandpiper, 3 Warbling Vireos, Wood Thrush, Yellow Warbler, Ovenbird, and a Baltimore Oriole. 

Jim Wilkinson