The Black-chested Buzzard-eagle is a bird of prey of the hawk and eagle family. 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. With a total length of c.25-30 in and weighing around 70 oz, it is a huge eagle-like "buzzard". It is rather long- and broad-winged, with a wingspan of about 70–80 in, and the slightly tapering tail is short by comparison and colored black, with grey tips in fresh plumage. The adult has a white underside, sometimes with fine blackish stripes; its upperparts are dark grey with a blackish, brownish or bluish hue. The feathers of the neck and the lowest dark feathers of the breast are somewhat elongated. Adults have an ash-grey-and-white zone on the wings, the silvery white seen clearly from afar. The female is distinguished by a reddish-cinnamon hue to the upper- and underwing secondaries and is considerably larger than the male.

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