Great Eagle

Great Eagles are the largest birds of prey in the Empire, with a wingspan that measures over thirty feet and having razor-sharp talons. They are an ancient race that has dwelled in the mountains of the Old World since long before the coming of Man. Most of them nest in the Grey Mountains, though a few live along the World's Edge range. They are exceedingly intelligent and a few of their eldest are even rumoured to be capable of speaking in the tongues of other races, though they seem to prefer most often to deal with Elves. The vision of Great Eagles is so sharp that they can clearly watch the movements of ground animals from miles away. Correspondingly, they are capable of executing devastating ambushes wherein they attack an opponent from such a great height that their target isn’t aware of his danger till their claws sink into his flesh.

The Great Eagles have long fascinated the scholars of the Empire for another reason: they seem to be immune to the taint of Chaos. All other natural creatures, when too long exposed to the warping effects of Chaos eventually mutate. Not so the Great Eagles.

Source

 * Warhammer Fantasy RPG 2nd ED -- Old World Bestiary (pg. 50-51, 98).