Adult and immature descriptions
Large, dark waterbird.
Long body, long neck, long tail.
Narrow, pointed wings.
Brown head, throat, chest, and upperparts.
White belly, vent, and wing linings
Juvenile is brown overall; belly ranges from mottled brown and white to mostly dark. Sharp line still visible between darker chest and lighter belly. Underwing coverts are pale. Bare parts generally dull gray.
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