Photos: 9
Forms: 5 (F/Breeding, F/Non-breeding, Juvenile, M/Breeding, M/Molting)
CA-BCUS-DCUS-IAUS-ILUS-INUS-MDUS-TNUS-VA
0ISSF.
Plumage varies, breeding (MAR-SEP) and non-breeding (SEP-MAR).
M/F differ, especially in breeding plumage. May be mistaken in wintering plumage.