A large white waterbird with black legs and a long black bill uniquely shaped like a spatula with a yellowish tip. In breeding the plumage from breast to thick crest acquires a warm yellowish wash. Sexes alike. Immature has a paler bill and black wing tips. Flies with neck and legs outstretched with flapping movements interspersed with gliding; neck is generally held low so that it looks as if the bird is struggling to keep the keep the bill raised.