I needed to go to work at Goddard Space Flt Cntr (PG Cty) for a few hours 
today, so I spent a couple of (early) hours birding there.  It started out 
!very! slow at about 7:15, with only a couple of flickers, some robins, and 
still more common birds.  After the first hour, it was heating up, so I 
started birding in the car.  Not sure whether it was the car or the 
time-of-day, but all of a sudden, things picked up dramatically.  I guess 
the best birds were a family of Blue Grosbeaks, but also had a gnatcatcher, 
a female Yellow Warbler, a couple of pewees, a cuckoo, at least 2 heard-only 
GC Flycatchers, etc.  Since I didn't see another soul there, the list is 
below.  About 9:30 the urge to cool off in my office overcame the birding 
urge - I'm a weather wimp.

    Bob Hartman
    Colesville

Great Blue Heron            1
Red-shouldered Hawk         1/h
Mourning Dove               4/h
Yellow-billed Cuckoo        1 1/h
Red-bellied Woodpecker      1/v
Downy Woodpecker            1/h
Northern Flicker            2/v
Eastern Wood-Pewee          2
Great Crested Flycatcher    2/h
Eastern Kingbird            2/i
Barn Swallow                1
Carolina Wren               2/h
House Wren                  1
Gray Catbird                1 1/h
Eastern Bluebird            1/m
American Robin              3
Blue-gray Gnatcatcher       1
Carolina Chickadee          5/v
Blue Jay                    3/h
American Crow               1/v
European Starling           6
Yellow Warbler              1/f
Song Sparrow                2
Blue Grosbeak               1/m 2/f
Indigo Bunting              3
House Finch                 2 one yellowish
House Sparrow               5