The Common Sandpiper (Actitis hypoleucos) is a small Palearctic wader. This bird and its American sister species, the Spotted Sandpiper, make up the genus Actitis. It is easily identified by its habit of "teetering": constantly bobbing head and tail while on the ground, particularly when feeding. Common Sandpipers feed restlessly and deliberately. They run along the water's edge, visually locating prey on the surface and not by probing in the mud. It has greyish-brown upperparts, white underparts, short dark-yellowish legs and feet, and a bill with a pale base and dark tip. In winter plumage, they are duller and have more conspicuous barring on the wings.