Adult DescriptionSmall plump waterbird. Short, pointed bill. Short, pointed tail. Breeding adult sooty brown on upperparts, mottled brown on underparts. Nonbreeding adult with blackish upperparts, white underparts. White extends up sides of head, almost all the way around the nape.
Immature DescriptionSimilar to non-breeding adult, but underparts lightly speckled, not clean white.