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Adult DescriptionMedium-sized, stocky waterbird. All dark gray, except for white belly. Breeding adult has vertical white projection at base of orange bill, and two thin white plumes on face.
Immature DescriptionSimilar to non-breeding adult, with dusky bill and a reduced "horn."
Relative Sizebetween robin and crow
- Both Sexes
- Length: 11.0-11.4 in (28-29 cm)
- Weight: 12.3-21.9 oz (350-620 g)
- Wingspan: 23.2-24.4 in (59-62 cm)