From Unfinished Tales-The Istari: "Eagles are Manwe’s birds, and they play a much more interventioinst role in the earlier ages because the Valar played a more

From Unfinished Tales-The Istari: "Eagles are Manwe’s birds, and they play a much more interventioinst role in the earlier ages because the Valar played a more interevtionist role in earlier ages of ME. The Eagles thus effectively withdraw in the Third Age other than for the intervention at Orthanc and at Mount Doom, as the Valar themselves no longer directly intervene-using instead the Istari, who themselves have strict limtations placed on their powers"