Andean Pygmy-Owl is uncommon in the humid montane and temperate forest of the Andes. Although in Peru it is limited to the east slope, it occurs on both slopes in the northern parts of its range. It is the only pygmy-owl occurring at such high elevations. In northern Ecuador, the Cloud-forest Pygmy-Owl (Glaucidium nubicola) approaches the elevational range of Andean; these two species are best separated by voice and elevation. Andean’s song is generally a few descending “wheeuuu-d’d” phrases followed by a series of mellow tooting whistles. The Andean Pygmy-Owl often perches on open tree branches, and is frequently mobbed by the small passerines that it hunts.