FIGURE 1. Plumage and bare part variation among some members of the T. nudigenis complex. A. T. n. nudigenis: Ocaña, dpto. Norte de Santander, Colombia (Dušan M. Brinkhuizen); B. T. maculirostris: Jorupe Reserve, Loja Province, Ecuador (Dušan M. Brinkhuizen); C. T. grayi casius: Parque del Centenario, Cartagena, dpto. Bolívar, Colombia (Eric VanderWerf); D. Individual pertaining to the Cauca River valley population: Pueblo Tapado, Montenegro, dpto. Quindío, Colombia (Francisco Piedrahita).