Sorry not the best pictures. Just thought it was funny to see them in a corn field, so had to post it. They were furiously feeding on something there, repeatedly dipping their beaks in the water as they moved around like a phalanx. Wish I knew what they were going after.
From Twin Dykes to Lighthouse along Lighthouse Rd and behind the Gates, St Marks NWR, Wakulla County, Florida, (30.112613, -84.159797), coordinate acccuracy about 3,500 meters