One of those quiet marsh scenes that has many little things happening.
The obvious first thing seen is the line of White Pelicans. I believe at this time the group was moving towards the far side to join a larger flock.

Right behind the Pelicans is a lone Tricolored Heron. In the background, along the marsh edge I found a Great Blue blending in as well as what looks to be a small Egret above him. That’s a dike path it is standing on.
Finally, and hard to find, left top appears to be a Swallow in flight. A guess for sure, but a safe bet as they are always zipping around here. View full screen and to me it’s a Swallow.
Taken in an old rice field, Donnelley wildlife area, South Carolina.