We birded Cambridge waterfront from Visitor's Center out to Hambrooks Bay from around 8-10am. The Eurasian Widgeon was hanging out at Great Marsh Park with American's just off the parking lot facing toward the bridge. Other birds in Cambridge were:
Double-crested Cormorant 
Mute Swan
Canada Goose 
Mallard 
American Widgeon 
Canvasback 
Lesser Scaup 
Long-tailed Duck 
Surf Scoter
Common Goldeneye
Bufflehead
Ruddy Duck (1 female)
Turkey Vulture
Ring-billed Gull
Great Black-backed Gull
Rock Dove
Blue Jay
American Crow
Fish Crow
Eastern Bluebird
European Starling
Song Sparrow
Red-winged Blackbird
Common Grackle
House Sparrow
 
Next was Blackwater NWR for a few hours in early afternoon with lots of Bald Eagles. We missed the Golden Eagle that's been hanging out there but did see one of the light ROUGH-LEGGED HAWKs as well as about 6 BROWN-HEADED NUTHATCHES that are hanging out near the parking lot at the Marsh Edge Trail. They were very vocal. Other birds at Blackwater:
Great Blue Heron
Great Egret (just one)
Tundra Swans (100's)
Canada Goose
Mallard
Northern Pintail
Northern Shoveler
Ring-necked Duck
Hooded Merganser (pair)
Common Merganser (6)
Turkey Vulture
Osprey (1 harassing a Bald Eagle)
Bald Eagle (all over the place)
Northern Harrier
Red-tailed Hawk
Rough-legged Hawk
American Coot (1 pair)
Killdeer
Ring-billed gull
Herring Gull
Blue Jay
Fish Crow
Carolina Chickadee
White-breasted Nuthatch
Brown-headed Nuthatch
Carolina Wren
Golden-crowned Kinglet
American Robin
Northern Mockingbird
European Starling
Song Sparrow
Swamp Sparrow
White-throated Sparrow
Slate-colored Junco