I was on the slope of Lookout (toward the cemetery) around 6:30 am, and heard a lot of bird chattering. They were active, but certainly not a "fall out." Most of the birds were on that slope, at the base of the Peninsula Meadow -- near the magic Bald Cypress tree-- and around LP 249. The possible Yellow-throated Vireo was at the edge of the Butterfly Meadow on Lookout, but it vanished into a tree top.
List:
Mute Swan
Mallard
Laughing Gull
Rock Pigeon
Mourning Dove
Chimney Swift
Red-bellied Woodpecker
Northern Flicker
Eastern Wood-Pewee
Least Flycatcher
Yellow-throated Vireo (80% confidence)
Blue Jay
Black-capped Chickadee
White-breasted Nuthatch
Carolina Wren
Blue-gray Gnatcatcher (Lamp post 249)
Veery
Swainson's Thrush (Lamp post 249)
American Robin
Gray Catbird
Northern Mockingbird
European Starling
Northern Parula
Magnolia Warbler
Prairie Warbler
Blackpoll Warbler
Black-and-white Warbler
American Redstart
Ovenbird
Common Yellowthroat
Wilson's Warbler
Northern Cardinal
Baltimore Oriole
American Goldfinch
House Sparrow