The black-chested buzzard-eagle (Geranoaetus melanoleucus) is a bird of prey of the hawk and eagle family (Accipitridae). It lives in open regions of South America. This species is also known as the black buzzard-eagle, grey buzzard-eagle or analogously with “eagle” or “eagle-buzzard” replacing “buzzard-eagle”, or as the Chilean blue eagle. It is sometimes placed in the genus Buteo. (source)