They die, not of old age, nor yet of sickness, or of hunger; but the upper part of the beak grows to such an extent, and becomes so curved, that they are unable to open it. They take the wing, and begin upon the labors of the chase at midday; sitting in idleness during the hours of the morning, until such time as the places of public resort are filled with people. It is said that this is the only bird that has never been killed by lightning; hence usage has pronounced it to be the armor-bearer of Jove. Caius Marius, in his second consulship, assigned the eagle exclusively to the Roman legions. Before that period it had only held the first rank, over four others, the wolf, the minotaur, the horse, and the wild boar, each of which preceded a single division. Some few years before his time it had begun to be the custom to carry only the eagle into battle, the other standards being left behind in camp; but Marius abolished the rest of them entirely. Since then, it has been remarked that hardly ever has a Roman legion encamped for the winter, without a pair of eagles making their appearance at the spot. The first two species of eagle not only prey upon the whole of the smaller quadrupeds, but will attack even deer. Rolling in the dust, the eagle covers its body all over with it, then perching on the antlers of the animal, shakes the dust into its eyes, while at the same time it beats it on the head with its wings, until the creature at last precipitates itself down the rocks. Nor is this one enemy sufficient for it; it has still more terrible combats with the dragon, and the issue is much more doubtful, although the battle is fought in the air. The dragon seeks the eggs of the eagle with a mischievous avidity; while the eagle, in return, carries it off whenever it happens to see it; upon these occasions, the dragon coils itself about the wings of the bird in multiplied folds, until at last they fall to the earth together. [Illustration: MARTIAL EAGLE.—_Spizáëtus bellicosus._] There is a very famous story about an eagle at the city of Sestos. Having been reared by a little girl, it used to testify its gratitude for her kindness, first by bringing her birds, and in due time various other kinds of prey: at last she died, upon which the bird threw itself on the lighted pile, and was consumed with her body. In memory of this event, the inhabitants raised upon the spot what they called a heroic monument, in honor of Jupiter and the damsel, the eagle being a bird consecrated to that divinity. CHAPTER IV. THE VULTURE AND THE HAWK.