Adult height: 43–55 in (120–140 cm); adult weight: 10-18 lbs (4.5–8 kg); wingspan: 89–113 in (225–285 cm); appearance and coloration: bare head and neck, black back, and white underparts, huge bill, a pink gular sac at its throat, a neck ruff, and black legs and wings; sexes are alike, but the young bird is browner and has a smaller bill.