diagnostics
70-81 cm. A peculiar ibis with a unique bald, fleshy, bulging red crown. The sexes are alike in plumage although males are longer-billed and longer-legged. Plumage dark with green-blue iridescence; maroon to copper iridescence on shoulder. Feathered ruff around base of neck; hackles of ruff reduced in non-breeding adults. Face and upper throat bare and white. Neck dark and feathered. Bill, eye, legs and feet red. Immature similar but with duller, less domed crown, off-white face and less pronounced neck-ruff. Juveniles lack iridescence and have duller bare parts (Barnes 2005).

