by Charles Darwin
day I shot a condor. It measured from tip to tip of the wings eight
and a half feet, and from beak to tail, four feet. This bird is
known to have a wide geographical range, being found on the west
coast of South America, from the Strait of Magellan along the
Cordillera as far as eight degrees north of the equator. The steep
cliff near the mouth of the Rio Negro is its northern limit on the
Patagonian coast; and they have there wandered about four hundred
miles from the great central line of their habitation in the Andes.
Further south, among the bold precipices at the head of Port Desire,
the condor is not uncommon; yet only a few stragglers occasionally
visit the seacoast.
A line of cliff near the mouth of the Santa Cruz is frequented by these birds, and about eighty miles up the river, where the sides of the valley are formed by steep basaltic precipices, the condor reappears. From these facts, it seems that the condors require perpendicular cliffs. In Chile, they haunt, during the greater part of the year, the lower country near the shores of the Pacific, and at night several roost together in one tree; but in the early part of summer, they retire to the most inaccessible parts of the inner Cordilleras, there to breed in peace.
|With respect to their propagation, I was told
by the country people in Chile, that the condor makes no sort of
nest, but in the months of November and December lays two large
white eggs on a shelf of bare rock. It is said that the young
condors cannot fly for an entire year; and long after they are
able, they continue to roost by night, and hunt with their
parents. The old birds generally live in pairs; but among the
inland basaltic cliffs of the Santa Cruz, I found a spot, where
scores must usually haunt. On coming suddenly to the brow of the
precipice, it was a grand spectacle to see between twenty and
thirty of these birds start heavily from their resting-place,
and wheel away in majestic circles. From the quantity of dung on
the rocks, they must long have frequented this place for
roosting and breeding. Having gorged themselves with carrion on
the plains below, they retire to these favorite ledges to digest
their food. From these facts, the condor, like the gallinazo,
must to a certain degree be considered as a gregarious bird. In
this part of the country they live altogether on the guanacos
which have died a natural death, or, as more commonly happens,
have been killed by the pumas. I believe, from what I saw in
Patagonia, they do not on ordinary occasions
extend their daily excursions to any great distance from their
The condors may oftentimes be seen at a great height, soaring over a certain spot in the most graceful circles. On some occasions I am sure that they do this only for pleasure, but on others, the Chileno countryman tells you that they are watching a dying animal, or the puma devouring its prey. If the condors glide down, and then suddenly all rise together, the Chileno knows that it is the puma which, watching the carcass, has sprung out to drive away the robbers. Besides feeding on carrion, the condors frequently attack young goats and lambs; and the shepherd dogs are trained, whenever they pass over, to run out, and looking upwards to bark violently. The Chilenos destroy and catch numbers. Two methods are used; one is to place a carcass on a level piece of ground within an enclosure of sticks with an opening, and when the condors are gorged, to gallop up on horseback to the entrance, and thus enclose them; for when this bird has not space to run, it cannot give its body sufficient momentum to rise from the ground. The second method is to mark the trees in which, frequently to the number of five or six together, they roost, and then at night to climb up and noose them.
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|They are such heavy sleepers, as I have myself
witnessed, that this is not a difficult task. At Valpariso,
I have seen a living condor sold for sixpence, but the
common price is eight or ten shillings. One which I saw
brought in had been tied with rope, and was much injured;
yet, the moment the line was cut by which its bill was
secured, although surrounded by
people, it began ravenously to tear a piece of carrion. In a
garden at the same place, between twenty and thirty were
kept alive. They were fed only once a week, but they
appeared in pretty good health. The Chileno countrymen
assert that the condor will live, and retain its vigor,
between five and six weeks without eating; I cannot answer
for the truth of this, but it is a cruel experiment, which
very likely has been tried.
When an animal is killed in the country, it is well known that the condors, like other carrion-vultures, soon gain intelligence of it, and congregate in an inexplicable manner. In most cases it must not be overlooked, that the birds have discovered their prey, and have picked the skeleton clean, before the flesh is in the least degree tainted. Remembering the experiments of M. Audubon, on the little smelling powers of carrion-hawks, I tried in the above-mentioned garden the following experiment: the condors were tied, each by a rope, in a long row at the bottom of a wall; and having folded up a piece of meat in white paper, I walked backwards and forwards, carrying it in my hand at the distance of about three yards from them, but no notice whatever was taken. I then threw it on the ground, within one yard of an old male bird; he looked at it for a moment with attention, but then regarded it no more. With a stick I pushed it closer and closer, until at last he touched it with his beak; the paper was then instantly torn off with fury, and at the same moment, every bird in the long row began struggling and flapping its wings.
Under the same circumstances, it would have been quite impossible to have deceived a dog. The evidence in favor of and against the acute smelling powers of carrion-vultures is singularly balanced. Professor Owen has demonstrated that the olfactory nerves of the turkey-buzzard (Cathartes aura) are highly developed; and on the evening when Mr. Owen s paper was read at the Zo logical Society, it was mentioned by a gentleman that he had seen the carrion-hawks in the West Indies on two occasions collect on the roof of a house, when a corpse had become offensive from not having been buried: in this case, the intelligence could hardly have been acquired by sight. On the other hand, besides the experiments of Audubon and that one by myself, Mr. Bachman has tried in the United States many varied plans, showing that neither the turkey-buzzard (the species dissected by Professor Owen) nor the gallinazo find their food by smell.
He covered portions of highly offensive offal with a thin canvas cloth, and strewed pieces of meat on it; these the carrion-vultures ate up, and then remained quietly standing, with their beaks within the eighth of an inch of the putrid mass, without discovering it. A small rent was made in the canvas, and the offal was immediately discovered; the canvas was replaced by a fresh piece, and meat again put on it, and was again devoured by the vultures without their discovering the hidden mass on which they were trampling. These facts are attested by the signatures of six gentlemen, besides that of Mr. Bachman.
Often when lying down to rest on the open plains, on looking upwards, I have seen carrion-hawks sailing through the air at a great height. When the country is level I do not believe a space of the heavens, of more than fifteen degrees above the horizon, is commonly viewed with any attention by a person either walking or on horseback. If such be the case, and the vulture is on the wing at a height of between three or four thousand feet, before it could come within the range of vision, its distance in a straight line from the beholder s eye, would be rather more than two British miles. Might it not thus readily be overlooked? When an animal is killed by the sportsman in a lonely valley, may he not all the while be watched from above by the sharp-sighted bird? And will not the manner of its descent proclaim throughout the district to the whole family of carrion feeders, that their prey is at hand?
When the condors are wheeling in a flock round and round any spot, their flight is beautiful. Except when rising from the ground, I do not recollect ever having seen one of these birds flap its wings. Near Lima, I watched several for nearly half an hour, without once taking off my eyes; they moved in large curves, sweeping in circles, descending and ascending without giving a single flap. As they glided close over my head, I intently watched from an oblique position, the outlines of the separate and great terminal feathers of each wing; and these separate feathers, if there had been the least vibratory movement, would have appeared as if blended together; for they were seen distinct against the blue sky.
The head and neck were moved frequently, and apparently with force; and the extended wings seemed to form the fulcrum on which the movements of the neck, body, and tail acted. If the bird wished to descend, the wings were for a moment collapsed; and when again expanded with an altered inclination, the momentum gained by the rapid descent seemed to urge the bird upwards with the even and steady movement of a paper kite. In the case of any bird soaring, its motion must be sufficiently rapid, so that the action of the inclined surface of its body on the atmosphere may counterbalance its gravity. The force to keep up the momentum of a body moving in a horizontal plane in the air (in which there is so little friction) cannot be great, and this force is all that is wanted. The movement of the neck and body of the condor, we must suppose, is sufficient for this. However this may be, it is truly wonderful and beautiful to see so great a horde, hour after hour, without any apparent exertion, wheeling and gliding over mountain and river
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