Chapter 14 of 16 · 3848 words · ~19 min read

Part 14

occasionally met with even in the human race, is perfectly and purely white. In order to explain this phenomenon, which is one of the most curious, but at the same time one of the most simple in physiology, it is necessary to observe that there exists beneath the epidermis, or outer covering of the skin, both in man and animals, a peculiar membrane of very fine and delicate texture, which is scarcely visible in the European but sufficiently obvious in the Negro, termed by anatomists the rete mucosum. In this net-work is secreted, from the extremities of the minute vessels which terminate upon its surface, a mucous substance which varies in colour according to the complexion of the individual, of the varieties in which it is the immediate cause; and from the substance thus secreted the colouring matter of the hairs and of the iris is derived. The pure whiteness then of the covering of the animal in question, and of all those which exhibit a similar variation from their natural tinge, is attributable solely to the absence of this secretion from whatever cause. It is always accompanied, as in the present instance, by a redness of the eyes, arising from the blood-vessels of the iris being exposed to view in consequence of the want of the usual coating formed by this secretion, by which they are naturally protected from the too great influence of the light. In the human race the individuals who are thus afflicted, characterized by the dull whiteness of their skins, the deep redness of their eyes, and their colourless, or, as it is generally termed, flaxen, hair, are called Albinos. They are generally timid in disposition, languid in character, and weak both in mind and body. The same original conformation, for it is always born with the individual and never acquired in after life, although sometimes prolonged beyond its limits in the shape of an hereditary legacy, is common to many animals. Perhaps the most familiar instances among these are the white mice, the white rabbits, and the white pigeons, which are known to every one. But it has also been occasionally seen in many other species, as monkeys, squirrels, moles, pigs, and even cows and horses, and, to come a little closer to our present subject, in goats and deer. Not even that massive and stupendous beast the Elephant is exempted from its influence. It can hardly be necessary to recall to the reader the title on which the ruler of millions of not uncivilized Asiatics, the Burmese monarch, prides himself more than on any other, inasmuch as it is the emblem of power and prosperity, that of Lord of the White Elephant; a title, which, while it demonstrates the fact of the existence of this deviation in the Elephant as well as in other animals, proves also the extreme rarity of its occurrence. It has moreover been noticed in many species of birds.

The present species of Antelope is spread over the whole of the Peninsula of Hindoostan and a part of Persia; but it is questionable whether it has been found in Africa, as is commonly asserted. They are said to bound with apparent ease over a distance of from twenty-five to thirty feet, and mounting to the height of ten or twelve. It is consequently useless to attempt to chase them in the common mode with hounds; and their pursuit is restricted to the higher nobility, who employ for the purpose either hawks, who pounce upon their quarry and detain it until the dogs can come up, or Chetahs, who attack them by surprise in the manner before described.

The elegant Albino now in the Tower was brought from Bombay by Captain Dalrymple of the Vansittart, and remained for a considerable time at Sand Pit Gate, where it was an especial favourite with his Majesty, as well on account of the gentleness of its disposition, as for its rarity and beauty. It bears its confinement in the Menagerie with perfect resignation, and is remarkable for the mildness and tranquillity of its deportment.

[Illustration]

THE AFRICAN SHEEP.

_OVIS ARIES._ LINN.--Var. _GUINEENSIS._

In characterizing the present genus, were we to look solely at the animal such as we have it daily before our eyes, the distinction between it and all the other Ruminants is too striking to be for a moment mistaken. But the insensible gradations which connect this familiar denizen of our downs and pastures with the untamed native of the desert and the precipice, and the close affinity which subsists between the latter and the goats, render it almost impossible to isolate them by any satisfactory characters. On the present occasion we shall content ourselves with observing that the sheep may generally be distinguished by the direction of their horns, by the elevation of their profile, and by their want of beard: characters neither essential nor infallible, but the best that can be offered.

The variety figured over leaf is in one of the many intermediate stages between unreclaimed barbarism and complete domestication. It is an awkward looking creature, high on the legs, narrow in the loins, and covered with a rough and shaggy coat. The back and sides are nearly black; the shoulders reddish brown; and the posterior part of the body, the haunches, the hind legs, and the tail, white; as are also the ears, which are rather large, the nose, and a spot over each eye. The horns, although the specimen is a male, are remarkably small, and enclose the ears within their curve. If the ears are freed from their confinement, the animal becomes very uneasy, and never rests until he has succeeded in replacing them, which he cannot accomplish without considerable difficulty. He was presented to the Menagerie by Lord Liverpool about six years ago, and is extremely mild in his temper.

[Illustration]

THE GREAT SEA-EAGLE.

_HALIAETOS OSSIFRAGUS._ SAV.

THE GOLDEN EAGLE.

_AQUILA CHRYSAETOS._ SAV.

Having in the preceding article terminated the series of Mammiferous Quadrupeds at present existing in the Tower Menagerie, we must next direct our attention to the illustration of the Birds, a Class which, although fully entitled to the second place in the arrangement of the Animal Kingdom, is separated by a wide and almost unoccupied interval from that which unquestionably claims the foremost rank.

To commence then with the Eagles, which form a prominent group of the Rapacious Order, and are universally regarded as the most majestic, as well as the most powerful, of birds. In common with the whole Order, they are remarkable for the strong incurvation of their bill and talons, the latter of which are four in number on each of the feet, and are moved by means of a thick and strong muscular apparatus, which gives to the grasp of the larger species that extreme tenacity by which they are distinguished, enabling them to seize and carry off fish and birds, and even quadrupeds of moderate size. This innate propensity to rapine, derived from their peculiar conformation which renders them essentially flesh-eaters, indicates at once the analogical relationship borne by the Rapacious Birds to the Carnivorous Quadrupeds; and the high degree to which it is carried by the Eagles, their vast powers of flight, their towering majesty, their irresistible might, their uniform preference of living victims and rejection of the offal, render them superior to all other birds, in the same proportion as the Lion is allowed to take the lead among mammiferous quadrupeds.

The Eagles, properly so called, are characterized by a head covered with plumage and flattened above; eyes large, lateral, and deep-seated; a bill of great strength, arched and hooked at its extremity alone, and furnished at its base with a naked membrane, called the cere, in which the openings of the nostrils are situated; the wings broad and powerful; the tarsus, or that joint of each leg which is immediately above the toes, strong, short, and covered with feathers down to the very base; the toes thick and naked, three of them pointing forwards, and the fourth constantly directed backwards; and the talons of great power and strongly curved. The Golden Eagle, which occupies the right hand in the cut, is frequently three feet and a half in length from the extremity of the beak to that of the tail. His general colour is blackish brown both above and below, assuming on the legs a grayish or sometimes a reddish tinge. His beak is bluish black, covered at the base by a yellow cere; and his toes, which are also yellow, terminate in strong black talons, the posterior one of which frequently attains an enormous length. He is met with throughout the Old Continent, and more especially within the limits of the temperate zone, building his aiery, which he shares with a single female, in the clefts of the loftiest rock, or among the topmost branches of the alpine forest. From this retreat he towers aloft in search of his prey, which he pursues by sight alone, subsisting principally on other birds and on the smaller quadrupeds, which he carries off in his powerful clutch. When his hunger is extreme he sometimes pounces upon the larger animals; but in such circumstances he is compelled to content himself with sucking their blood upon the spot, and with stripping off portions of their flesh, on which to satiate his appetite at home. Instances have been known of his attaining in captivity to an age of more than a hundred years.

The principal distinguishing mark of the group which has been separated under the name of the Sea-Eagles, consists in the plumage of the tarsus, which in the latter extends only half way down, the lower part being consequently left entirely bare. The species figured on the left, at the head of this article, is commonly more than three feet in length, and the expansion of his wings measures seven or eight feet. His bill is usually of a bluish black colour towards the extremity, and yellow at the base. His general hue is blackish brown, deeper above than beneath, and relieved on the breast and under parts by numerous white spots. The larger feathers of his wings are nearly black; but those of the tail are not so deeply tinged. The naked portion of the legs, as also the toes, are covered with bright yellow scales; and the talons are of a bright black.

The Great Sea-Eagle is a native of the Northern Hemisphere, in the colder regions of which he appears to be most at home. He builds his nest in similar situations with the last, but prefers the neighbourhood of the sea, or of lakes and rivers, over which he is frequently to be seen, especially in the morning and towards nightfall, hovering in quest of prey, and pouncing down upon the fish which rise to the surface, or even diving after those which are visible beneath. These form his principal sustenance; but he seldom suffers flesh or fowl to escape him if they chance to fall in his way. His flight is less rapid and less lofty than that of the Golden Eagle; and he neither perceives his prey at such a distance, nor pursues it with such pertinacity.

The noble birds which illustrate the present article were presents from the Marchioness of Londonderry.

[Illustration]

THE BEARDED GRIFFIN.

_GYPAETOS BARBATUS._ STORR.

The Bearded Griffin takes an intermediate station between the Eagles and the Vultures, with the former of which it agrees more closely in general appearance and external form, and with the latter in internal structure and habits. The principal point in which it differs from them both consists in the tuft of bristly hairs which take their origin partly from the cere that covers the base of the beak, and partly from the under mandible, and are directed outwards and downwards in such a manner as to give rise to that appearance from which the bird has received his epithet of Bearded. His beak is strongly arched at the extremity, and is remarkable for its great vertical thickness, more especially at the point where the curvature commences. His head, flat like that of the Eagle, is covered with short feathers, which are of a dirty white; and his eyes are nearly on the same plane with the surface of his head. The general tint of his plumage is blackish brown above and grayish fawn beneath, and his legs are feathered with the latter colour down to the very toes, which are long and grayish. His claws are of moderate length and curved; but the force of his clutch is far inferior to that of the Eagles.

The Bearded Griffin is the largest European bird of prey, and builds its aiery among the loftiest precipices of nearly all the alpine chains of the Old Continent. Here it displays the tyranny, but not the courage, of the Eagle, attacking such living animals only as are likely to fall an easy prey, and gorging in troops with all the rapacity of Vultures upon the most corrupted carrion.

The individual figured is a fine specimen, but is not yet in perfect plumage.

[Illustration]

THE GRIFFON VULTURE.

_VULTUR FULVUS._ LINN.

If the Eagles are considered as bearing a close analogy to the more noble and perfect among the Carnivorous Quadrupeds, such as the Lion and the Tiger, which live in solitary grandeur and attack none but living victims, the Vultures may, with equal propriety, be regarded as the representatives of the Jackal, the Wolf, the Hyæna, and other inferior animals of that Order, which hunt in packs and prey upon carrion. Endowed like these animals with an extreme fineness of scent, they are attracted by the smell of dead, and more especially of putrid, carcases, at an immense and almost incredible distance; and usually assemble in vast numbers to glut themselves upon the disgusting banquet on the field of recent battle, or wherever the work of carnage has been carried to any great extent. Under such circumstances, however horrible that propensity may appear which leads them to prey upon the unburied corpses, they unquestionably fulfil a wise provision of nature by removing from the surface of the earth a mass of corruption and putridity which in the warmer climates where they abound would otherwise taint the very atmosphere, and might possibly give rise to diseases still more fatal in their effects than the malignant passions of man himself, from which the destruction sprung. But although such a scene affords the greatest scope for the indulgence of their depraved appetites, and consequently congregates them together in the largest numbers, it is happily of rare occurrence, and their usual subsistence is derived from the bodies of dead animals. To these they are attracted by the smell, and frequently in flocks so numerous as actually to cover and conceal the object of their attack, from which they tear away large gobbets, and swallow them entire and with insatiable avidity, never ceasing while yet a morsel remains. It is only when hard pressed by hunger that they venture to attack a living creature; and their ravages of this kind are always confined to the peaceful and timid denizens of the poultry-yard. They never carry off their victims in their talons, but uniformly devour them upon the spot; and even that portion of their prey which they transport to their young is first swallowed, and afterwards disgorged in the nest.

These peculiarities of habit, by which the Vultures are strikingly contrasted not merely with the Eagles, but even with the smallest of the Falcon tribe, are the necessary result of their organisation. Their beak, it is true, is like that of the Eagles strongly curved at the point alone, and they also possess all the technical characters of the Rapacious Order; but their talons are far inferior, both in size and in the degree of their curvature, and they are consequently unable to grasp their prey with sufficient force to transport it through the air. Their diminished power of flight renders them incapable of soaring upwards to search abroad with piercing eye for the objects of their rapacity; and they are therefore left dependent upon the acute sensibility of their nostrils, which amply supplies the deficiency. Of the external characters which they exhibit the most remarkable is derived from the want of plumage on the head and neck, which are covered in the greater number of the species by nothing more than a sort of down or by short and smooth hairs. The object of this provision appears to be to enable them to bury as it were their heads in the carrion on which they feed, without exposing their plumage to be soiled by the filth which it might otherwise contract. Their eyes are placed on a level with their cheeks; their heads are rounded above; they have most frequently a ruff of considerable extent round the lower part of their necks; and their legs are usually bare of feathers and covered with large scales. Their very attitudes offer the most perfect contrast to those of the Eagles; the latter constantly maintaining a bold upright posture, with their wings closely pressed to their sides, and their tails elevated, while the Vultures on the contrary are always seen bending forwards in a crouching position, with their wings depressed and separated from their bodies, and their tails trailing upon the ground.

The Griffon Vulture is equal in size to the larger species of Eagle; his head and neck are covered with short white down, and the latter is ornamented at its base with an extensive ruff of long feathers of a clear and brilliant white. The plumage of the body is reddish gray; the quill-feathers of the wings and tail are of a blackish brown; and the beak and claws are nearly black. He is a native of the greater part of Europe and of Asia, and inhabits during the summer the more elevated regions of the two continents, building his nest in the rocks and among inaccessible precipices. In the winter he is said to migrate to warmer and more temperate climes. His habits are precisely those of the rest of the group to which he belongs.

[Illustration]

THE SECRETARY BIRD.

_GYPOGERANUS SERPENTARIUS._ ILLIG.

The singular conformation of this bird, so different in many respects from that of the Order to which both in its leading characters and in its habits it obviously belongs, rendered it for a long time one of the torments of ornithologists, who puzzled themselves in vain to assign it a definitive place in the system, and could not agree even with regard to the grand division of the class to which it ought to be referred. Thus M. Temminck was at one time inclined to refer it to the Gallinaceous Order; and M. Vieillot, after repeatedly changing his mind upon the subject, at last arranged it among the Waders, with which it has absolutely nothing in common except the length of its legs. It appears, however, to be now almost universally admitted that its closest affinity is with the Vultures, with which it agrees in the most essential particulars of its organization, and from which it differs chiefly in certain external characters alone, which unquestionably give to it an aspect exceedingly distinct, but are not of themselves of sufficient importance to authorize its removal to a distant part of the classification. It constitutes in fact one of those mixed and aberrant forms by means of which the arbitrary divisions of natural objects established by man are so frequently assimilated to each other in the most beautiful, and occasionally in the most unexpected, manner.

The principal generic characters of the Secretary consist in the form of his beak, which is shorter than the head, thick, and curved nearly from the very base, where it is covered with a cere; in the long and unequal feathers which take their origin from the back of his head, and are susceptible of elevation and depression; in the naked skin which surrounds his eye, and which is shaded by a series of hairs in the form of an eyebrow; in the great length and slenderness of his tarsi, which form his most striking characteristic in an Order remarkable for a structure exactly the reverse; and in the shortness of his toes, which are terminated by blunted talons of little comparative size or curvature. The only known species measures upwards of three feet in length. Its plumage, when in a perfect state, is for the most part of a bluish gray, with a shade of reddish brown on the wings, the large quill-feathers of which are black. The throat and breast are nearly white, and the rest of the under surface of the body offers a mixture of black, red, and white, the plumage of the legs being of a bright black, intermingled with scarcely perceptible brownish rays. The plumes of the crest which ornaments the back of the head, and from the supposed resemblance of which to the pens frequently stuck behind the ears of clerks and other writers the name of Secretary was given to the bird, are destitute of barbs at the base, but spread out as they advance, and are coloured with a mixture of black and gray. Each of the wings is armed with three rounded bony projections, with which, as well as with his feet, the bird attacks and destroys his prey.

In his habits he partly resembles both the Eagle and the Vulture, but differs from them most completely in the nature of his prey and in his mode of attacking it. Like the former he always prefers live flesh to carrion; but the food to which he is most particularly attached consists of snakes and other reptiles, for the destruction of which he is admirably fitted by his organization. The length of his legs not only enables him to pursue these creatures over the sandy deserts which he inhabits with a speed proportioned to their own, but also places his more vulnerable parts in some measure above the risk of their venomous bite; and the imperfect character of his talons, when compared with those of other rapacious birds, is in complete accordance with the fact that his feet are destined rather to inflict powerful blows, than to seize and carry off his prey. When he falls upon a serpent, he first attacks it with the bony prominences of his wings, with one of which he belabours it, while he guards his body by the expansion of the other. He then seizes it by the tail and mounts with it to a considerable height in the air, from which he drops it to the earth, and repeats this process until the reptile is either killed or wearied out; when he breaks open its skull by means of his beak, and tears it in pieces with the assistance of his claws, or, if not too large, swallows it entire.