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- Medium-sized to large waterbird.
- Long red and black bill; lower half longest.
- Black back and cap.
- Underparts white.
- Very short red legs.
- Long, pointd wings.
Immature DescriptionSimilar to adult, but with mottled black-and-white back and head.
- Both Sexes
- Length: 15.8-19.7 in (40-50 cm)
- Weight: 7.5-15.8 oz (212-447 g)