This medium stork stands 91–97 cm tall, making it slightly smaller than the closely related painted stork. The adult plumage is completely white except for black flight feathers of the wing and tail, which also have a greenish gloss. Wing length measures 435–500 mm and the tail measures 145–170 mm. The extensive white portion of the plumage is completely suffused with a pale creamy yellow during the breeding season, hence the term “milky”. This creamy tint is absent from the plumage during breeding. The wing coverts and back feathers are paler and have an almost white terminal band.