Dozens of bone fragments were uncovered by a dry lake in 2016 by researchers from Flinders University in Adelaide.
A new study says the skeletal remains were of the Archaehierax sylvestris, or ancient hawk of the forest.
Scientists believe the ancient raptor species survived by swooping on prey, including birds, possums and koalas.
They say the eagle had adapted to hunting and flying within forests, with short robust wings, long legs and a wide foot-span.