Black-breasted Buzzard (Hamirostra melanosternon)
It is a handsome bird. So far I have still never seen one in the wild. The one I photographed was in the Healesville Sanctuary near Melbourne, where they put on a display of free-flying (falconry style) of some of their raptors, including this species and a Wedge-tailed eagle.
Very cool bird - looks like he's wearing a native headdress. Gorgeous.