Buteo ventralis.

Also known as the Patagonia Red-Tailed Hawk. A medium size bird of prey found in forested areas of southern Chile and Argentina. Feeds on small mammals and birds. Very little has been published as far as population, prey animals, and breeding.

Ferguson-Lees, J., Christie, D. and Franklin, K. (2005). Raptors of the world. Princeton: Princeton University.