The Collaborative International Dictionary of English v.0.48:

Chaja \Cha"ja\, n. [Native name.] (Zool.)
   The crested screamer of Brazil (Palamedea chavaria syn.
   Chauna chavaria), so called in imitation of its notes; --
   called also chauna, and faithful kamichi. It is often
   domesticated and is useful in guarding other poultry. See
   Kamichi.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Chauna
    n 1: crested screamers [syn: Chauna, genus Chauna]