hoactzin

from The Century Dictionary.

• noun The Opisthocomus cristatus, a remarkable bird of South America, of uncertain affinities, differing so much from all other known birds that a superfamily group, Opisthocomi or Heteromorphæ, has been formed for its reception. Also hoatzin, hoazin.

from the GNU version of the Collaborative International Dictionary of English.

• noun A crested ill-smelling South American bird (Opisthocomus hoazin) whose young have claws on the first and second digits of the wings.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun crested ill-smelling South American bird whose young have claws on the first and second digits of the wings