The MARTIAL HOODED EAGLE (_Spizaëtos bellicosus_) is the largest and strongest member of this group. This powerful bird is three feet long, and of great breadth; the wing measures two feet, the tail fourteen inches. Its plumage is extremely simple; the upper part of the body is a beautiful brown, the head of a darker shade; the individual quills of the mantle have a light edge, and the wings a border formed by the light tips of the feathers that form the large wing-covers; a white stripe passes over the eyes to the back of the head; the entire lower parts of the body are white, shaded with blue; the tail is dark brown above, light brown beneath, and striped crossways with six dark lines; the outer web of the large quills is black, the inner lighter in colour and darkly striped; the lower wing-covers are pure white, the eye is greyish brown, the cere greenish, the beak black, and the feet lead colour. This species, which is an inhabitant of Africa, has been so little noticed by modern travellers that in describing its habits we must quote Le Vaillant, who wrote at the close of the last century; from this source we learn that the Martial Eagle lives in pairs, which keep together with the greatest constancy, each couple remaining jealously apart from others of their own kind. The nest is usually built upon a solitary tree, and from this point the pair fly forth, and spread terror over the surrounding country. No bird, however large, is safe from their pursuit, and even when Vultures and Ravens combine in the hope of collectively routing the common enemy, they are no sooner face to face with the foe than they are ignominiously put to flight. These Eagles destroy antelopes and hares in great numbers; and are, in fact, the tyrants of the districts they inhabit. When on the wing, their motions are light and rapid; their voice is sometimes harsh and deep, and at others sharp and penetrating. These birds usually build upon the summits of trees; sometimes, however, though rarely, their nest is placed in holes of rocks. The cradle for their young is formed of three distinct layers, the first being formed of thick and knotty branches, the second consists of twigs, moss, and large leaves, and the third is a lining composed of still more delicate and elastic materials; the whole structure is about four or five feet in diameter, and so strongly built that it will bear a man's weight; the same nest is repaired and employed year after year during the entire life of the couple by whom it was originally constructed. The eggs, of which there are two, are about three inches long, pure white, and almost round. The female alone broods, but both parents unite in the enormous labour required to feed their voracious young, whose gaping mouths they find it almost impossible to satisfy; indeed, the tales told of the quantity they devour seem almost to border on the fabulous. THE TUFTED EAGLE.