This spotted sandpiper was sprinting and darting down the beach. This bird's white eye rings are quite distinctive, as is its gait.
The spotted sandpiper is well adapted to life near the water. As you can see in the photo, its yellowish-brown legs with dark spots look very much like sticks commonly found on the shore, and the bird's main coloration blends in well with the mixture of dark and white rocklets on the beach.