The Collaborative International Dictionary of English v.0.48:

cock of the rock \cock of the rock\, cock-of-the-rock
\cock-of-the-rock\n.
   a bird of the Andes (Rupicola peruviana) similar to
   Rupicola rupicola.

   Syn: Rupicola peruviana.
        [WordNet 1.5]

   2. tropical bird of Northern South America (Rupicola
      rupicola), the male having brilliant red or orange
      plumage and an erectile disklike crest.

   Syn: cock of the rock, Rupicola rupicola.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Rupicola rupicola
    n 1: tropical bird of northern South America the male having
         brilliant red or orange plumage and an erectile disklike
         crest [syn: cock of the rock, Rupicola rupicola]