It’s a Yellowlegs, most likely the ‘Lesser’ shorter billed version. I think you would need to be holding one in each hand to be sure. I just call all these smaller guys ‘shore birds’, it’s easier.
This is the most common of the little guys out in the marshes. In the air they are like lightening and make a whistling noise with their wings. Extended wings shows a V feather pattern making an ID much easier.
I thought these shots were a nice representation of which animals actually live out there. This is just scratching the surface of the species we find, but it does give an idea of a typical marsh scene.
These photographs were taken in the Donnelley wildlife area within the ACE Basin of South Carolina.