This morning I walked south from Old Court Rd in Patapsco Valley State Park, 
Baltimore County.  Highlights included 

1 singing Yellow-throated Warbler, 
4 yellow Palm Warblers, 
1 Pine Warbler, 
3 Blue-gray Gnatcatchers, 
3 Ruby-crowned Kinglets, and 
1 Brown Creeper.   

A female bluebird carried nesting material into a natural cavity in a snag by 
the trail.

John Hubbell
Washington DC