Size: L: 160 cm. Wt: 7500 g. Males and females similar. This species is seasonally dimorphic, but is only seen in nonbreeding colours on the Great Lakes.

Nonbreeding Adult: head and body white, with long curved neck, and black wingtips; bill long, massive, yellow-orange to orange, with large gular pouch; skin around eye yellow-orange; legs orange, with totipalmate feet

Juvenile: similar to nonbreeding adult, but with greyish head and neck, and brown mottling on wing coverts