The Collaborative International Dictionary of English v.0.48:

turaco \turaco\, turacou \tu*ra"cou\, n. [Cf. F. touraco.]
   (Zool.)
   Any one of several species of large brightly crested birds of
   the genus Turacus, native of Africa. They eat plantain and
   are remarkable for the peculiar green and red pigments found
   in their feathers. [Written also touraco, touracou, and
   turakoo.]
   [1913 Webster + WordNet 1.5]

WordNet (r) 3.0 (2006):

turacou
    n 1: large brightly crested bird of Africa [syn: touraco,
         turaco, turacou, turakoo]