A small gray and brown sandpiper (Calidris arenaria) very common on sandy beaches in America, Europe, and Asia. Called also curwillet, sand lark, stint, and ruddy plover.
The Sanderling (Calidris alba, syn. Crocethia alba or Erolia alba) is a small wader. It is a circumpolar Arctic breeder, and is a long-distance migrant, wintering south to South America, South Europe, Africa, and Australia.