The great blue turaco (Corythaeola cristata) is a bird species of the family Musophagidae. At 70–76 cm (28–30 in) in length, it is the largest species of turaco. It has predominantly grey-blue plumage with an upright blue-black crest around 10 cm (3.9 in) high. The male and female have similar plumage. It is widespread throughout the African tropical rainforest.
Generally, the great blue turaco is 70–76 cm (28–30 in) in length with a mass of 800–1,231 g (1.764–2.714 lb).The adult great blue turaco has predominantly grey-blue upperparts with an upright blue-black crest, white chin, yellow-green lower breast and yellow belly darkening to chestnut brown posteriorly.