Two Willets walking on a beach, St. Lucie Inlet Preserve State Park.
Audubon Field Guide Sanderling…
This is the little sandpiper that runs up and down the beach “like a clockwork toy,” chasing the receding waves. Plumper and more active than most small sandpipers, and quite pale at most times of year, a good match for dry sand. Sanderlings nest only in limited areas of the far north, but during migration and winter they are familiar sights on coastal beaches all over the world.