These solitary fliers are easily spotted by their broad wings and short, wedge-shaped tails. As with many avian species, the males and females are colored differently. The male has a white underside with black stripes; its upper parts are black with an ash-gray white area on the wings, which appears silvery gray from a distance. The female has cinnamon-colored areas both on the tops and bottoms of its wings and is larger than the male. The birds are most often seen in mountainous regions as far south as Tierra del Fuego, and survive on mammals such as rabbits for their prey.