BONELLI'S HAWK EAGLE (Pseudactos Bonellii), as the European representative of this group is called, is about two feet four inches long, and four feet ten inches broad; the wing measures one foot four inches, and the tail ten inches. The female is three inches longer and four inches broader. Upon the brow the plumage is white, as is also a streak passing over the eyes; the top of the head and nape are brown, darkly striped; the upper part of the back is white, its feathers having blackish-brown spots upon their edges; the mantle is of a uniform dark brown, and blackish brown at its extremity; the upper tail-covers are white, mottled with brown; the throat, breast, and centre of belly white, the shafts of the feathers spotted with black; the upper surface of the tail is greyish brown, tipped with white, and marked with seven crooked dark lines; the under side is whitish yellow, spotted with brownish grey. In the young the top of the head is light red, the nape fawn colour, the mantle light brown, each feather being bordered with reddish yellow; the tail is greyish brown above, streaked ten times, and edged with white; the lower portion of the body is principally of a pale yellowish brown, the feathers having delicate dark streaks upon the shafts; the belly and lower wing-covers are dirty reddish white, without any markings. The eye is bronze colour, the beak greyish blue, the cere and feet greyish yellow.
These Eagles are common in Germany, Greece, and South Italy, and more numerous than any others in Spain and Algiers, where they frequent bare mountains; they are also met with in north-western Africa and India, always resorting to the hilly districts of the latter country. These birds do not migrate, but wander at large in considerable flocks, except during the breeding season, when they are extremely unsocial, prudently permitting none of their companions to approach the nest. In disposition the Hawk Eagle has much in common with the group whose name it bears, equalling the Gos-Hawk in courage and hardihood, but far exceeding it in bodily powers. When upon the wing its movements will bear comparison with those of the Falcon, but when perched its attitude is much less imposing. The eye of this species is peculiarly brilliant and fiery in its glance, clearly indicating the disposition of its owner, whose fierce boldness often leads it to contend with the largest and most formidable of its race. Some writers tell us that the Hawk Eagle confines its attacks to water birds, but this is not the case; in Spain it is numbered amongst the most terrible invaders of the poultry-yard, whence it will carry off a good fat hen under the very eyes of its owner. Jerdon mentions having seen it in India seize upon and bring down Peacocks. The eyrie, which is usually placed in holes of rocks, is but rarely met with; one found by Krüper in Greece contained two eggs, the walls were formed of sticks, and the interior was lined with down. The eggs differed from each other, both in colour and markings, one being of a dirty white without spots, and the other pure white, and distinctly speckled. The nest to which we allude must have been an uncommonly warm cradle for the nestlings, for it was so placed as to be exposed to the full force of the sun's rays.
The HOODED EAGLES (Spizaëtos) are slender in form, with short wings, long tails, and high, powerful feet, one distinguishing character being the possession of a more or less developed tuft upon the back of the head.
THE MARTIAL HOODED EAGLE.
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.
The TUFTED EAGLE (Lophoaëtos occipitalis), also an inhabitant of Africa, is considerably smaller than its congeners, and easily recognisable by the crest that adorns its head. The body is compact, the wings long, the tail short, and the tarsi high. The plumage is almost entirely dark brown, deepest in shade upon the belly, and lightest on the breast; the edges of the wings, the base of the crest, lower wing-covers, the plumage upon the tarsi, roots of the tail-feathers, and three crooked streaks passing over the tail are of a whitish hue. The eyes are bright yellow, the beak greyish blue, dark at its tip, and light towards its base; the cere is pale yellow, and the feet straw colour. The length of this bird is about nineteen inches and three-quarters, its breadth forty-six inches; the wing measures twelve and three-quarters, the tail seven inches. The female is one inch and a quarter longer and two inches broader than her mate.
The Tufted Eagle is met with in considerable numbers in the countries watered by the Upper Nile, where it usually frequents groups of Mimosa trees, perching amongst the branches for hours together, with eyes half closed, as it lazily spreads or closes the crest upon its head. At such times it has very little the appearance of a bird of prey; but should some poor mouse, rat, pigeon, or squirrel venture near the spot where it indolently reposes, all the instincts of an Eagle are at once exhibited, and the apparently idle dreamer darts down upon its victim with a boldness and rapacity fully equalling that displayed by some European Hawks; in fact, despite the smallness of its size, it may be regarded as one of the most terrible of the numerous freebooters inhabiting the African forests. We learn from Le Vaillant that this species builds upon trees, and lines its nest with wool or feathers, and that the eggs, two in number, are almost round, of a whitish colour, and marked with reddish-brown spots. The Tufted Eagle is but rarely brought to Europe; indeed, the Zoological Gardens of London, Antwerp, and Hamburg are, we believe, the only places of public resort that have boasted a living specimen of this very striking species, whose streaming crest, dark, rich plumage, and fiery eyes, cannot fail to render it an object of interest. It may be kept alive for many years in this country if carefully tended, and is but little sensitive as to climate. A Tufted Eagle that we saw in confinement was very lively, and uttered its cry lustily, both morning and evening; but in its general behaviour showed little of the courage for which it is remarkable in a state of freedom.