The Dunlin undergoes one of the most dramatic changes in appearance of all shorebirds when it molts from winter to breeding plumage. In winter, these medium sized sandpipers are brownish gray above with white underparts, but in breeding plumage they have a striking rufous-brown back and cap and black belly. Females are larger than males but otherwise similar in appearance.
The Dunlin is an abundant transient and winter visitant in estuaries and occasionally on beaches along the coast of Oregon, but significant numbers winter in the Willamette Valley, especially the southern part.