Sorry for the late post.  Yesterday morning along with the usual suspects at 
HH, I found a Common Harrier perched at the back of the second wetland area 
on the right.  It lingered for about 15 minutes before flying off.

Both types of orioles, pronothary and yellow warblers, a flock of indigo 
buntings and common moorhen all in great light in close view-- pretty neat.

Matt Von Hendy
Rockville