Mixed flock of mostly robins.
This partial out-of-focus view is going to be tough, but my best guess is a yellow-rumped warbler.
Two seen from platform.
Yellow throat = Audubon's yellow-rumped warbler?
Spooked from the marsh, in a flock of half dozen or so. No other ducks seen.
In mixed flock of mostly robins.
Perched a bluebird nestbox. Several around the park visitor center.
On a trail sign.
Floating dead in a forest stream.
Not sure about this one-- four petals. Blooming in roadside big patches, a few seen trailside. Occurrence on transport corridors suggest that they might be human-transported and non-native?
Leaves at base, and scattered on stem.