Great Horned Owl is a very large, tufted owl generally found in open habitats. Its deep, hooting call is commonly heard, particularly around dawn and dusk. Birds can often be observed hunting for mammals and other small animals from prominent perches at night, dusk, dawn or even during the day. It is relatively catholic in its selection of a nest site, breeding in an old raptor nest, in a broken-off tree stump, on a cliff, in a cave, or on a prominent man-made structure. Birds of the Andes from Peru south as well as Patagonia (B. v. magellanicus) are paler and smaller and are often treated as a separate species, the "Magellanic" Horned Owl.