The Rufous Piha (Lipaugus unirufus) is a common lowland Cotinga that I hear more often than see (of course this is true of most Costa Rican birds!). This guy has a variety of calls/songs.
This is the national bird of Peru, known as Gallo del Roca, or as Cock of the Rock in English. It is found in the lower Andes and in the adjacent Amazon basin. Captive near Santa Cruz, Bolivia.In context at www.dixpix.ca/Amazon/fauna/birds/perch_birds/index.html