Source : Webster's Revised Unabridged Dictionary (1913)

Tschego \Tsche"go\, n. [From a native name.] (Zo["o]l.)
   A West African anthropoid ape allied to the gorilla and
   chimpanzee, and by some considered only a variety of the
   chimpanzee. It is noted for building large, umbrella-shaped
   nests in trees. Called also {tscheigo}, {tschiego},
   {nschego}, {nscheigo}.