Given my success on Tuesday, I again walked through the SI gardens this morning.  Here is what I saw/heard in terms of migrants:
   Enid Haupt Garden (behind the Castle)
A singing Yellow Warbler
Several singing Common Yellowthroats

   Mary Ripley Garden (between the A&I Building and the Hirshhorn)

Another singing Yellow Warbler
Singing Ovenbird
Several singing Yellowthroats

-> Two Wilson's Warblers chasing each other around the shrubs lining the wall between the garden and the Hirshhorn gardens.

Jim

Jim Felley
Smithsonian Institution