
This Sanderling has already begun its transition from summer to winter plumage. Summer plumage is usually much brighter and flashier for breeding while winter plumage is dull.
This little bird is a traveller. It can travel up to almost 13,000 km between its winter and summer homes. It nests in both Arctics. It is amazing that this little bird has such endurance. I have added a picture with a Sanderling next to a Semipalmated Plover for size comparison. This bird is only about 20 cm.