The northern cassowary (Casuarius unappendiculatus) also known as the one-wattled cassowary, single-wattled cassowary, or golden-necked cassowary, is a large, stocky flightless bird of northern New Guinea. It is one of the three living species of cassowary, alongside the dwarf cassowary and the southern cassowary. It is a member of the superorder Paleognathae.
The northern cassowary has a hard and stiff black plumage, blue facial skin and a casque on top of the head. It has a bright red or yellow coloured neck and wattle. The feet are huge and strong with long, dagger-like claw on its inner toe. The sexes are similar in appearance. The male, at 30 to 37 kg, is smaller than the female, at an average of 58 kg, making it the fourth heaviest living bird species after the common ostrich, Somali ostrich and the southern cassowary. These birds measure 149 cm long and stand 1.5–1.8 m in height.