I observed a very cooperative blue-winged warbler this morning for half and 
hour at Layhill Park.  It was working the trees between the southmost parking 
lot and the soccer field.

Also seen:

northern parula
yellow warbler
brown thrasher
blue-gray gnatcatcher
field sparrow
chipping sparrow
tree swallow
chimney swift
towhees, cardinals, white-throated sparrows, goldfinches, blue jays, 
chickadees, brown-headed cowbirds, grackles, robins, mocking birds, and 
crows.

_____
David Gersten
Silver Spring, MD