What is "curwillet"

Sanderling \San"der*ling\, n. [Sand + -ling. So called because it obtains its food by searching the moist sands of the seashore.] (Zo["o]l.) 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.