- Small waterbird.
- Stocky and without apparent neck.
- Short, stubby bill.
- In breeding plumage, entirely black back, head, and chest; white belly.
- In nonbreeding plumage, black back, cap, and face; white throat and underside, with dark neckband.
Immature DescriptionSimilar to nonbreeding adult, but slightly browner.
Relative Sizebetween robin and crow
- Both Sexes
- Length: 7.5-9.1 in (19-23 cm)
- Weight: 4.7-7.2 oz (134-204 g)
- Wingspan: 15.0 in (38 cm)