Part 16

They are frequently divided into two great sections; the one, which is by far the most numerous, comprehending all those in which the poison-fangs are wanting, and which are consequently dangerous only in proportion to the extent of their muscular force; and the other consisting of those in which the fangs are present, and the bite of which is accompanied with the pouring out of a venomous secretion. At the head of the first of these divisions rank the Boas, which in the Linnean arrangement comprehended all those snakes, whether venomous or not, whose under surface was covered with narrow transverse plates, and whose tail was destitute of rattle. Later zoologists have, however, confined that appellation to those among the Linnean Boas, which are without poisonous fangs and have claws near the vent, and have regarded as a distinct genus the snakes which in addition to these latter characters have the scales of the under surface of the tail so arranged as to form two distinct rows. To the latter, which inhabit the Old Continent exclusively (while the former are all of them natives of America), they have assigned the name of Python.

The present species, which is commonly exhibited under the popular but erroneous title of the Boa Constrictor, appears to be the Pedda Poda of Dr. Russell’s Indian Serpents. It is said by that writer to attain a length of eight or ten feet; but living specimens have been brought to this country of twice that size, and some of those now in the Tower are fifteen or sixteen feet long. The number of transverse plates on the under surface of the body is stated to be two hundred and fifty-two, and that of the pairs of scales beneath the tail sixty-two. The back is elegantly marked with a series of large irregular brown blotches bordered with black; and numerous smaller spots are scattered along the sides. The ground colour is yellowish brown, lighter beneath.

The extent of muscular power which these serpents possess in common with the Boas is truly wonderful. To the smaller among them the lesser quadrupeds and even birds fall an easy prey; but the larger, when excited by the stimulus of hunger, are capable of crushing within their spiral folds the largest and most powerful of beasts. The sturdy buffalo and the agile stag become alike the victims of their fatal embrace; and the bulk of these animals presents but little obstacle to their being swallowed entire by the tremendous reptile, which crushes them as it were into a mass, lubricates them with the fetid mucus secreted in its stomach, and then slowly distending its jaws and œsophagus to an extent proportioned to the magnitude of the object to be devoured, and frequently exceeding by many times its own previous size, swallows it by one gradual and long-continued effort.

Of the mode in which this operation is effected, a detailed description is contained in Macleod’s Voyage of His Majesty’s Ship Alceste; and an excellent account has been subsequently given by Mr. Broderip in the second volume of the Zoological Journal from actual observation of the specimens now in the Tower. The vivid description of the latter almost brings before the reader’s eye the lightning dash of the serpent; the single scream of its instantly enfolded victim, whose heaving flanks proclaimed that it still breathed; and its last desperate effort, succeeded by the application of another and a deadly coil. With equal force and fidelity it sketches the continuation of the scene, when the serpent, after slowly disengaging his folds, placed his head opposite to that of his victim, coiled himself once more around it to compress it into the narrowest possible compass, and then gradually propelled it into his separated jaws and dilated throat; and finally presents a disgusting picture of the snake when his meal was at an end, with his loose and apparently dislocated jaws dropping with the superfluous mucus which had been poured forth.

The individual figured at the head of the present article is a female; a fact which was proved by the remarkable circumstance of her producing in May last, after having been more than two years in the Menagerie, a cluster of eggs, fourteen or fifteen in number, none of which, however, were hatched, although the mother evinced the greatest anxiety for their preservation, coiling herself around them in the form of a cone, of which her head formed the summit, and guarding them from external injury with truly maternal solicitude. They were visible only when she was occasionally roused; in which case she raised her head, which formed as it were the cover of the receptacle in which they were enclosed, but replaced it again as quickly as possible, allowing to the spectator only a momentary glance at her cherished treasures.

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THE ANACONDA.

_PYTHON TIGRIS_, Var.

The Anaconda is a name which, like that of the Boa Constrictor, has been popularly applied to all the larger and more powerful snakes. It appears to be of Ceylonese origin, and may therefore belong of right, as well as of usage, to the present Indian species. The serpent which passes under this title at the Tower, and which is figured above, seems to differ in no essential respects from the Boa of the preceding article, the only appreciable distinctions between them consisting in the lighter colour, the greater comparative size of the head, and the acuteness of the tail of that which at present engages our attention.

Happily the appetite of these gigantic snakes bears no proportion to their means of gratifying it, as a full meal is uniformly succeeded by a state of torpor, which frequently lasts for a month or six weeks, or, during the cold season, even for a longer period. Those in the Tower, which are kept in a state of artificial warmth, usually feed about every five or six weeks, and a fowl or a rabbit generally suffices for a meal. These are held by the keeper within view of the serpent to ascertain whether he is inclined to take his prey or not. About three years ago Mr. Cops, while thus engaged in offering a fowl to one of the Boas, had nearly met with a serious accident; the snake, which was almost blind from the approaching change of its skin, missing the fowl, and seizing upon the keeper’s thumb instead, around which and its own head it instantaneously threw two coils, and then, as if surprised at the unexpected resistance, cast an additional fold round his neck, and fixed itself by its tail to one of the posts of its cage in such a manner as nearly to throttle him. His own exertions, however, aided by those of the under keepers, at length disengaged him from his perilous situation; but so determined was the attack of the snake that it could not be compelled to relinquish its hold until two of its teeth had been broken off and left in the thumb.

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THE RATTLESNAKE.

_CROTALUS HORRIDUS._ LINN.

If the Boas furnish the most terrible examples of the tremendous powers of destruction possessed by a few of that division of the Serpent tribe, whose bite is unattended with the effusion of venom, the Rattlesnakes afford a no less remarkable instance of the dreadful malignity of the poison with which others of the tribe are so abundantly supplied. This poison is secreted by a gland of considerable size situated beneath the eye, the excretory duct of which terminates on each side at the base of a long and tubular fang in the upper jaw, which is concealed while the animal is at rest in a fold of the gum, but is capable of being instantaneously erected when he is irritated, and affords at the same time the means of inflicting the wound and of insinuating into it the deadly fluid with which it is charged. In the Rattlesnakes these two fangs are the only visible teeth implanted in the upper jaw; but behind each of them are several rudiments of others by which they are from time to time replaced. Their other distinguishing characters consist in the whole of the transverse plates which cover the under surface of the body and of the tail being simple, and in the singular apparatus by which the latter is terminated, and which is formed of a series, more or less numerous according to the age of the individual, of flattened rings loosely attached one within the other in such a manner as to produce a peculiar rattling sound when the tail is moved with any degree of quickness. The number of rings commonly varies from five to twelve; but in very old specimens it is said to have been found to exceed forty.

All the known species are natives of America, in the vast forests of which they may be said literally to swarm; but happily, like most of the other venomous snakes, they never exert their terrible qualities upon man except in self-defence, and the warning rattle is always heard to give notice of their approach. Their bite is almost uniformly fatal even to the largest animals, and the latter frequently evince such an instinctive dread of them, that, according to M. Bosc, it is almost impossible to compel a horse or a dog to advance towards them. Their food consists principally of the smaller quadrupeds, such as squirrels and rabbits, of other reptiles, and of birds, although they rarely climb trees in pursuit of their prey. It was long believed, and the notion is still popularly current, that they possessed the power of fascinating their victims, which were thought to be so completely under the influence of their glance as to precipitate themselves of their own accord into the open throat of their enemy; but the truth appears to be that they actually inspire so great a degree of terror that the animals selected for their attacks are commonly rendered incapable of offering such resistance as might otherwise be in their power, or even of attempting to escape from their pursuit.

Like most reptiles they retire during the winter into holes, in which they remain in a torpid state until the return of spring; and during this period they may be taken or destroyed without danger. Their flesh is eaten by the negroes, who also apply their fat, as well as their rattles, to various medicinal or superstitious uses.

The number at present in the Tower exceeds a hundred, varying from four to six feet in length, and differing very considerably from each other both in colour and markings.

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CHISWICK: PRINTED BY CHARLES WHITTINGHAM, COLLEGE HOUSE.

End of Project Gutenberg's The Tower Menagerie, by Edward Turner Bennett