The most marked examples of the passing away of animal species within periods of time, in some cases not very remote, pronounced of even in a historical sense, is seen in the record of certain gigantic birds. The largest individuals of the feathered tribes now extant are ostriches; but the time was when these plumed denizens of the Sahara were small indeed by comparison with existing species. Some idea of the bulk of the epiornis—an extinct species—may be gathered from a comparison of the bulk of one of its eggs with that of other birds. According to M. Isidore Geoffroy, who some time since presented one of these eggs to the French Academy of Sciences, the capacity of it was no less than eight litres and three-fourths. This would prove it to be about six times the size of the ostrich's egg, 148 times that of an ordinary fowl, and no less than 50,000 times the size of the egg of the humming-bird. The egg exhibited was one of very few that have been discovered; hence nothing tends to the belief that it was one of the largest. The first knowledge of the existence of this gigantic bird was acquired in 1851. The sole remains of the species hitherto found are some egg-shells and a few bones. These suffice, however, for an ideal reproduction of the creature under the synthetical treatment of comparative anatomy. The epiornis inhabited Madagascar. The creature's height could not have been less than from nine to twelve feet, and the preservation of its remains is such as to warrant the belief in its comparatively recent existence.
Of a structure as large as the epiornis, probably larger, though differing from the latter in certain anatomical particulars, according to the belief of Professor Owen, is a certain New Zealand giant bird, called by him the dinornis. As in the case of the Madagascar bird, the evidence relating to this is very recent. Some few years ago an English gentleman received from a relative settled in New Zealand some fragments of large bones that had belonged to some creature of species undetermined. He sent them to Professor Owen for examination, and was not a little surprised at the assurance that the bones in question, although seemingly having belonged to an animal as large as an ox, were actually those of a bird. The comparative anatomist was guided in coming to this conclusion by a certain cancellated structure possessed by the bony fragments, a characteristic of the bones of birds. For a time Professor Owen's dictum was received with hesitation, not to say disbelief, on the part of some people. The subsequent finding of more remains, eggs as well as bones, soon justified the naturalist's verdict, however. Not the slightest doubt remains now upon the mind of any zoologist relative to the past existence of the dinornis; nay, the [{530}] impression prevails that this feathered monster may be living in some of the more inaccessible parts of the southern island of New Zealand at the present time. Be that as it may, the dinornis can only have become extinct recently, even using this word in a historical sense, as the following testimony will make manifest:—
A sort of mummification prevailed amongst the Maories until Christianity had gained ground amongst them. The process was not exactly similar to that by which Egyptian mummies were formed, but resembled it, nevertheless, in the particular of desiccation. Smoking was the exact process followed; and smoked Maori heads are common enough in naturalists' museums. In a general way Maori heads alone were smoked, certain principles of food economy prompting a more utilitarian treatment for entire bodies. Nevertheless, as a mark of particular respect to some important chief now and then, affectionate survivors exempted his corpse from the oven, and smoking it entire, set it up amongst the Maori lares and penates as an ornament. This explanation is not altogether par parenthèse, for it brings me to the point of narrating some evidence favorable to the opinion that the dinornis cannot have been extinct in New Zealand even at a recent historical period. Not long ago the body of a Maori was found in a certain remote crypt, and resting on one hand was an egg of this bird giant. Contemplate now the bearings of the testimony. The Maori race is not indigenous to New Zealand, but arrived there by migration from Hawai. Not alone do the records of the two groups of Pacific islands in question advert to such migration, but certain radical coincidences of language lend confirmation. It is further a matter of tradition that the migration took place about three hundred years ago. Now, even if the recently discovered specimen of Maori mummy art had been executed on the very first advent of the race, the period elapsed would be, historically speaking, recent. The laws of chance, however, are adverse to any such assumption; and, moreover, the degree of civilization—if the expression may be used—implied by the dedication of an entire human body to an aesthetic purpose, instead of devoting it to one of common utility—could only have been achieved after a certain lapse of time.
According to Professor Owen, there must have been many species of dinornis. The largest individuals of one species, according to him, could not have been less than four yards high. According to the same naturalist, moreover, these birds were not remarkable by their size alone; they had, he avers, certain peculiarities of form establishing a link between them and the cassowary and apteryx: the latter a curious bird still found in New Zealand, but very rare nevertheless.
Of colossal dimensions as were the dinornis and epiornis, the size of both sinks into insignificance by comparison with another giant bird, traces of which, and only traces, are discoverable in North America, at the epoch when the deposit of the conchylian stage of Massachusetts was yet soft enough to yield under the feet of creatures stepping upon its surface. Footsteps, indeed, are the only traces left of these giant birds, and they are found side by side with the imprints of drops of rain which fell on the yielding surface in those early times. Mostly the footmarks only correspond with three toes, but occasionally there are traces of a fourth—a toe comparable to a thumb, only directed forward, not backward. Marks of claws are occasionally found. Every trace and lineament of the Massachusetts bird is marvellously exceptional. The feet must have been no less than fifteen inches long, without reckoning the hinder claw, the length of which alone is two inches. The width must have been ten inches. The intervals between these footmarks correspond evidently with the stride of the monster, which got over the ground by covering successive stages of from [{531}] four to five feet! When we consider that the stride of an ostrich is no more than from ten to twelve inches, the application of this record will be obvious. Here closes the testimony already revealed in respect of this bird, except we also refer to it—which is apocryphal—certain coprolites or excrementitious matters found in the same formation.
For the preceding facts naturalists are indebted to the investigations of Mr. Hitchcock. The evidence adduced leaves no place for doubt as to the previous existence of a giant bird to which the traces are referable. Naturalists, however, were slow to come to this conclusion; so extraordinary did it seem that a bird should have lived at a period so remote as that when these geological formations were deposited. To gain some idea of the antiquity of that formation, one has only to remember that the conchylian stage is only the fifth in the order of time of the twenty-eight stages of which, according to Alcide D'Orbigny, the crust of the earth is made up, from the period of primitive rocks to the present date. However, many recent facts have tended to prove that several animals, mammalians and saurians amongst others, are far more ancient than had been imagined; after which evidence these giant bird footprints have lost much of the improbability which once seemed to attach to them.
Pass we on now to the traces of another very curious bird, the existence of which has been demonstrated by Professor Owen, according to whom the creature must have lived at the epoch of the schists of Sobenhofen. The name given by Professor Owen to this curious extinct bird is archeopterix. Its peculiarities are so numerous that for some time naturalists doubted whether it should be considered a reptile or a bird; between which two there exist numerous points of similarity. And now, whilst dealing with bird-giants, it would be wrong not to make some reference to a discovery made in 1855, at Bas Meudon, of certain osseous remains, referable to a bird that must have attained the dimensions of a horse; that floated on water like a swan, and poised itself at roost upon one leg. Monsieur Constant Prevost, the naturalist who has most studied the bird, gave to it the name of gastornis Parisiensis. The bony remains of this creature were found in the tertiary formation in a conglomerate associated with chalk, which refers the gastornis to a date more remote than any yet accorded to any other bird.
From a bare record of facts contemplate we now our planet as it must have been when inhabited by the monstrous birds and reptiles and quadrupeds which preceded the advent of man. These were times when animated forms attained dimensions which are now wholly exceptional. That may be described as the age when physical and physiological forces were dominant, as the force of moral agency dominates over the present, and is destined, as appearances tend to prove, to rule even more fully hereafter. Might it not seem that in nature an economy is recognizable similar to the economy of human existence? Can we not recognize an antagonism between the development of brute force and of the quality of mind? Would it not even seem that nature could not at one and the same time develop mental and corporeal giants? The physiological reign has only declined to prepare the advent of moral ascendancy. Giant bodies seem fading from the earth, and giant spirits commencing to rule. Humanity is progressive; is not its progression made manifest by these zoological revelations? The first bone traces of human beings range back to an epoch posterior to the monstrous quadrupeds entombed in the diluvium. Hereafter giants, probably, will only be seen in the moral world, grosser corporeal giant forms having become extinct. The physical gigantesque is not yet indeed banished from the earth, but the period of its [{532}] banishment would seem to be at hand.
The probability is that all the great birds to which reference has been made were, like the ostrich, incapable of flight. This defect, when contemplated from the point of view suggested by modern classifications, seems one of the most remarkable aberrations of nature of which we have cognizance. For a bird to be deprived of what seems the most essential characteristic of bird-life—to be banished from the region that we have come to regard as the special domain of bird-life—bound to the earth, forced to mingle with quadrupeds—seems to the mind the completest of all possible departures from established type.
Thoughts such as these result from our artificial systems and classifications. Apart from these, the conditions of giant walking birds that were, and to a limited extent are, will be found to harmonize well with surrounding conditions. Suppose we take the case of the ostrich for example; this bird being the chief living representative of giant bird-life remaining to us from the past. In the ostrich, then, do we view a creature so perfectly adapted to conditions which surround it that no need falls short and no quality is in excess. A complete bird in most anatomical characteristics, it borrows others from another type. The sum of the vital elements which normally, had the ostrich been like flying birds, should have gone to endow the wings, has been directed toward the legs and feet, and thereupon concentrated. Bird qualities and beast qualities have mingled, and, as we now perceive, have harmonized. If to the ostrich flying is denied—if it can only travel on foot, yet is it an excellent pedestrian. A quality of which it has been deprived we now find to have been transmuted into another quality—the ostrich has found its equivalent.