Best birds perhaps Tennessee Warbler and Least Sandpiper.
Abbreviated ebird lists...

Location:     Meadowside Nature Center
Observation date:     5/14/11
Number of species:     40

Spotted Sandpiper     1     Lake Frank
Yellow-throated Vireo     1
Veery     1
Tennessee Warbler     1     Heard singing near feeders.
Chestnut-sided Warbler     2
Black-throated Green Warbler     1
Blackburnian Warbler     1
Prairie Warbler     1
American Redstart     3
Louisiana Waterthrush     1
Rose-breasted Grosbeak     1     Female at feeders.

Location:     Lake Needwood
Observation date:     5/14/11
Number of species:     12

Veery     1
Swainson's Thrush     1
Black-throated Green Warbler     2
Blackpoll Warbler     1

Location:     Lake Needwood - north end
Observation date:     5/14/11
Number of species:     12

Great Blue Heron     4
Great Egret     2
Spotted Sandpiper     3
Solitary Sandpiper     5
Least Sandpiper     1
Northern Rough-winged Swallow     6
Yellow Warbler     1     Singing

Knut Waagan, Silver Spring

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