 What can be determined is that in all probability, the group originated on either side of the Atlantic, which during that time was only 60–80% its present width.On the other hand, as evidenced by fossils like "Pengana", some 25 mya, accipitrids in all likelihood rapidly acquired a global distribution – initially probably even extending to Antarctica.Specimen AMNH FR 2941, a left coracoid from the Late Eocene Irdin Manha Formation of Chimney Butte (Inner Mongolia) was initially assessed as a basal mid-sized "buteonine"; it is today considered to be more likely to belong in the Gruiformes genus "Eogrus".