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Adult Description
Small plump waterbird. Black face and crown. Gray upperparts. White sides of neck, throat, and underparts. Short, pale yellow bill.Immature Description
Resembles nonbreeding adult, with little or no white feathers around crown, and a darker bill.Relative Size

between robin and crowMeasurements
- Both Sexes
- Length: 7.9-9.4 in (20-24 cm)
- Weight: 5.4-8.8 oz (153-250 g)
- Wingspan: 17.7-18.1 in (45-46 cm)