Common Sandpiper

Common Sandpiper is a small Palearctic wader, 18 to 20 cm long with a wingspan of 32 to 35 cm. Adults have greyish-brown upperparts, white underparts, short dark-yellowish legs and a bill with a pale base and dark tip. In winter the plumage is duller with more conspicuous wing barring, and juveniles are more heavily barred above with buff edges to the wing feathers (Wikipedia, general species account). (Wikipedia, general species account).

In winter plumage, they are duller and have more conspicuous barring on the wings, though this is still only visible at close range. But its darker legs and feet and the crisper wing pattern (visible in flight) tend to give it away, and of course they are only rarely found in the same location. The eastern edge of its migration route passes by Palau in Micronesia, where hundreds of birds may gather for a stop-over. (Wikipedia, general species account).