Since no one else has posted yet, here's my summary (eBird 
report below).  Great day!  Warblers seen by me and/or by 
others include: BLUE-WINGED, NASHVILLE, NORTHERN PARULA, 
CHESTNUT-SIDED, MAGNOLIA, BLACK-THROATED BLUE, 
YELLOW-RUMPED, YELLOW-THROATED, PALM, CERULEAN, 
BLACK-AND-WHITE, AMERICAN REDSTART, WORM-EATING (was this 
confirmed?), OVENBIRD, COMMON YELLOWTHROAT, and HOODED. 
Maybe someone had a waterthrush too?  I pretty much did the 
whole circuit: ridge, equestrian field, maintenance yard, 
dog run, nature center.

Location:    Rock Creek Park
Observation date:    5/2/08
Notes:    My first visit to Rock Creek Park this season. 
Lots of good birds, though I missed some that others had 
(including Yellow-billed Cuckoo, Belted Kingfisher, Magnolia 
Warbler, Yellow-throated Warbler, Cerulean Warbler, and 
maybe Worm-eating Warbler).  May have heard American 
Redstart and Fish Crow.  Also saw Eastern Gray Squirrels, 2 
White-tailed Deer, and 4 chipmunks.
Number of species:    50

Wood Duck    3	male, female
Double-crested Cormorant    1
Great Blue Heron    1
Rock Pigeon    1
Mourning Dove    2
Ruby-throated Hummingbird    1	female
Red-bellied Woodpecker    3	male, female
Downy Woodpecker    3	female
Northern Flicker    1    heard only
Pileated Woodpecker    1    heard only
Great Crested Flycatcher    2
Yellow-throated Vireo    1    heard only, maybe 2
Blue-headed Vireo    1
Red-eyed Vireo    4
Blue Jay    3
American Crow    10    maybe more
Carolina Chickadee    5    probably more
Tufted Titmouse    2
White-breasted Nuthatch    2
Carolina Wren    2    heard only
House Wren    2
Ruby-crowned Kinglet    2
Blue-gray Gnatcatcher    5    probably more
Eastern Bluebird    1	male
Wood Thrush    4    heard only
American Robin    20    probably more
Gray Catbird    2
European Starling    2
Blue-winged Warbler    1    heard only
Nashville Warbler    1    maybe 2?
Northern Parula    2
Chestnut-sided Warbler    1	male
Black-throated Blue Warbler    2	male
Yellow-rumped Warbler    20    probably more
Black-throated Green Warbler    4
Palm Warbler    1
Black-and-white Warbler    3
Ovenbird    5    heard only
Hooded Warbler    1    heard only, clearly
Scarlet Tanager    1	male
Eastern Towhee    2	male
Chipping Sparrow    3
Song Sparrow    2    heard only
White-throated Sparrow    2
Northern Cardinal    5    probably more, both sexes
Indigo Bunting    1	male
Brown-headed Cowbird    5    maybe more
Baltimore Oriole    5    maybe more
American Goldfinch    5
House Sparrow    30    probably more, both sexes

This report was generated automatically by eBird v2(http://ebird.org)

D

-- 
Derek C. Richardson, Laurel, PG County, MD
http://www.astro.umd.edu/~dcr/Archives/Photos/birds.html