These are American Oyster Catchers, one of the faster shore birds. They made a large loop around us and came past at the best possible angle. That’s the only was I could have caught them.
As the name suggests their primary food is the oyster.
Very clever birds, they wait until an oyster cracks open their shell to push their lower mandible inside and pry it open. I can’t open them with a specially designed knife.
Coastal South Carolina.