When I arrived at LB at about 7:15 this AM, a bird was singing what sounded 
to me just like a Blackpoll Warbler song.  It was near the top of the big 
tree at the parking lot entrance, and persisted for about 5 minutes.  I 
never got a good look at it, but when it flew up the hill it seemed warbler 
sized, and black/white.  All my Maryland Blackpoll sightings have been 
between May 7 and May 16, so a sighting now must be unlikely.  If not a 
Blackpoll, what else could it be?  What I heard was 10-12 high-pitched 
chirps, at a rate of about 4 per second (faster than a Black-and-White 
Warbler or a Bay-breasted, and not as squeaky as a Cape May), then repeating 
after a pause of about 10 seconds.  The recordings sound exactly like that 
to me.

Other than that, the only unusual bird I encountered was a heard-only 
Kentucky, up the hill (north) from the "dip" in the trail.  The L. 
Waterthrushes seem to have stopped singing, and the few C. Yellowthroats I 
heard were singing a very elaborate song, certainly not "witchety".

    Bob Hartman
    Colesville, MD