We present extensions of geographical or altitudinal distributions for 25 species of birds from 11 localities in the Western Andes of Colombia, obtained between 2003 and 2012. We found several endemic species with restricted distributions, closely associated with topographic formations such as the Pinche, Munchique, Farallones de Cali, Tatamá and Frontino massifs. We describe potential threats to the avifauna, mainly caused by human activities producing transformation of land and forest cover due to the proliferation of illicit crops and illegal mining; the presence of illegal armed groups delays the continuation of research and access to unexplored areas of this region.