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]