I ran down to Chain Bridge after work today to see if I could get a 
picture of the Tundra Swan there.  Here it is:

http://mysite.verizon.net/vzep1nyj/dcswan/

Other birds seen during my visit include:
3 Great Blue Herons
6 Black-crowned Night-herons
3 adult Wood Ducks, 6 young
1 Osprey
1 Yellow-billed Cuckoo
1 Belted Kingfisher
1 Acadian Flycatcher
1 Great-crested Flycatcher
9 Northern Rough-winged Swallows
3 Barn Swallows
4 Cedar Waxwings
1 Blue-gray Gnatcatcher
2 Warbling Vireos
1 Red-eyed Vireo
1 Northern Parula
1 Yellow Warbler
1 Indigo Bunting
1 Baltimore Oriole
1 Orchard Oriole

John Hubbell
Washington DC