Cassell's book of birds; vol. 2

by Alfred Edmund Brehm

Space will not allow us to quote Audubon's description at greater length, and we must, therefore, endeavour to give particulars of the habits of the Sea Eagles in as few words as possible. All the various species of these birds pass their entire lives upon or in the immediate vicinity of the sea-coast, only ranging further inland during the time that elapses between leaving the nest and choosing a mate. As far as we can ascertain it is an extremely rare occurrence to find a pair of Sea Eagles building upon forest trees, even when the latter are situated in well-watered districts, if at any great distance from the sea-coast. Except during the breeding time they are social, and pass the night together, selecting trees, rocks, or, when the weather is warm, small islands as their resting-places. At the first dawn of day the whole party is astir, and hastens at once in pursuit of food, usually preferring such prey as Ducks, Auks, fish, or the smaller Cetaceans. Homeyer mentions having seen these bold and powerful birds overcome a fox, in spite of the cunning usually displayed by the wary quadruped in eluding danger. Sheep and goats are frequently destroyed. The Sea Eagles dive deep into the water to obtain fish, seize young dog-fishes as they swim close to the mother's side, and have been known even to carry off children. In Kamschatka it is not uncommon for these tyrants of the coast to be drawn under water and drowned, whilst contending with a dolphin or sturgeon; Lenz mentions having seen a Sea Eagle on one occasion seize one of the latter, which was too heavy to be raised from the water; all endeavours of the sturgeon to drag its enemy beneath the waves proved fruitless; the bird would not relinquish its hold, and both floated along together, presenting the appearance of a skiff in full sail. At last some men, who had been attracted by so strange a sight, came up to the struggling combatants in a boat, and succeeded in capturing them both.

In comparison with the flight of the True Eagle, the movements of the Haliaëtos in the air are slow and heavy; upon the ground, however, it moves with great facility, and can dive to a certain depth. In the development of its senses it is not inferior to its more noble relatives, but, unlike them, combines so much cruelty and rapacity with its courage as to deprive its disposition of that majesty popularly attributed to the King of Birds. The breeding season commences about March, and though each male has but one mate during its entire life, many and frequent are the battles that arise about the possession of these often very hardly-earned partners. Count Wodzicki gives an interesting account of the pertinacity and fury with which these disputes are sometimes carried on. Two male Eagles, he tells us, that came under his own observation, fought almost incessantly, falling upon each other with beak and claws, and rolling upon the ground until their feathers flew in all directions and blood flowed. During these encounters the female sat apart, and rewarded the victor by her caresses, with the utmost indifference as to which of the two should obtain her for his mate. After a fortnight spent in constant battles, the strongest bird remained for the time in possession of the field, but no sooner did the pair leave their eyrie, after rearing their young family, than the disappointed rival at once renewed his attacks with so much ferocity as to kill his adversary, after a short but severe struggle.

The eyrie of the Sea Eagle is a large structure, from five to seven feet in diameter, and from one and a half to two feet high, formed externally of branches as thick as a man's arm, and lined with twigs; the interior is rendered warm and soft with down plucked from the mother's breast. The brood consists of from two to four eggs, about three inches long; the shell is thick, rough, and coarsely grained, sometimes white without any markings, and occasionally spotted with red or brown. What period of time elapses before the nestlings escape from the egg is not yet known, but it has been ascertained that both parents assist in the work of incubation. The young do not leave the nest until from ten to thirteen weeks after their birth, and even then return to it at night; it is only as autumn approaches that they finally withdraw from parental care. The Sea Eagle is extremely shy, and therefore captured with great difficulty. In Norway small stone huts are erected for this purpose, outside which a piece of flesh, fastened to a string, is laid upon the ground; the other end of the string is held by a man within the hut, who no sooner perceives that his bait is taken, than he draws up the piece of meat, which the bird will not relinquish, and by this means usually succeeds in bringing the huge creature to close quarters, and killing it or making it prisoner. When caged the Sea Eagle soon becomes tame, and learns to distinguish its friends amid a crowd of strangers; indeed, so thoroughly does it accustom itself to its new life, that one with which we were familiar, having escaped from confinement, used to return every day to visit its companions, and was at last re-captured while perched upon their cage. These Eagles have been killed in various counties in England, and are not uncommon in the rocky parts of the western and northern counties of Ireland; they are said to be common in Scotland, and breed in the Hebrides, Orkney, and Shetland. Dr. Heysham, in his catalogue of Cumberland animals, says that they breed occasionally in the neighbourhood of Keswick and Ullswater.

THE AFRICAN SCREAMING SEA EAGLE.

The AFRICAN SCREAMING SEA EAGLE (Haliaëtos vocifer) is pure white upon the head, throat, nape, and upper part of the breast and tail; the mantle and quills are blueish black; the edges of the wings, and underside of the latter, are of a rich brownish red; the eye-rings, cere, and feet, light yellow; and the beak blueish black. In the young birds the plumage on the upper part of the head is blackish brown, mingled with white; the nape and back of the head, white, intermixed with brownish grey. The upper portion of the shoulders, and lower part of the back, are white, the feathers tipped with brownish-black spots; the front of the throat and upper part of the breast are white, streaked with brown; the rest of the lower portions of the body being entirely white; the quills are brown, and white at the root; the tail-feathers white, spotted and tipped with brown. The plumage is moulted many times before the bird appears in its full beauty. This species is about twenty-eight inches long; the wing measures nineteen and the tail six inches.

THE WHITE-HEADED SEA EAGLE (Haliaëtos leucocephalus).

The Screaming Sea Eagle was first seen by Le Vaillant in South Africa, afterwards by other travellers in Western Africa, and by ourselves in the interior of that continent, where it appeared to live exclusively upon the banks of the Blue and White Nile. Le Vaillant, on the contrary, found it on the sea-coast, and only exceptionally near large rivers. It is, however, in the primitive forests of Soudan that these beautiful birds are seen in their full glory, and, as they perch side by side among the foliage, afford a spectacle that cannot fail to rivet the traveller's attention, even should he have been long accustomed to the wonders of the African continent. In its life and habits this species resembles its congeners. It lives in pairs, each couple occupying a certain district, usually about half a mile in extent; over this they range from early morning till noon, when they rise into the air and entertain themselves with a variety of evolutions, meanwhile uttering yells that can be heard at a considerable distance. During the afternoon and evening, they sit side by side upon the branch of a tree occasionally bowing their heads, spreading their tails like a fan over the extremities of their wings, and screaming loudly should any strange object appear. Each couple has a favourite resting-place, to which they resort with unfailing regularity. At night they prefer to seek shelter in the inmost recesses of their leafy retreats. We found these birds so entirely without fear at the approach of man as to allow a shot to whistle past them without any indication of alarm: nevertheless, Le Vaillant speaks of them as shy and cautious. The food of the Screaming Sea Eagle consists of fish and carrion, the former is obtained by swooping upon it from a considerable height; the prey is generally carried to the water's edge, and there devoured. We were on one occasion much amused by observing the manner in which a little bird (Hyas Ægypticus) assisted in the demolition of a large fish that had been safely landed and stripped of its flesh by one of these Sea Eagles. The small but courageous pilferer ran with the rapidity of lightning to the spot, seized upon a few scraps, and hurried away to devour them at a distance, repeating this operation till its hunger was appeased, the Eagle meanwhile turning its head from time to time to observe its manœuvres, but without making any attempt to interfere with its operations. Towards other birds of prey the Sea Eagle is far from exhibiting this amiable disposition, and usually succeeds in overcoming even the Vulture, should the latter interfere with its prey. In Soudan, the period of incubation commences with the rainy season. The eyrie is built upon high trees, or pieces of rock, and is formed of branches lined with some warm and elastic material; the brood consists of two or three purely white eggs. When caged these birds soon become very tame, and accustom themselves so easily to our climate, that they may be allowed to fly about in the open air.

THE AFRICAN SCREAMING SEA EAGLE (Haliaëtos vocifer).