Many of those birds accustomed, by the privileges granted them by law, of remaining about cities and villages in our southern states, seldom leave them, and might almost be called a second set, differing widely in habits from those that reside constantly at a distance from these places. Accustomed to be fed, they are still more lazy; their appearance exhibits all the nonchalance belonging to the garrisoned half-paid soldier. To move is for them a hardship, and nothing but extreme hunger will make them fly down from the roof of the kitchen into the yard, or follow the vehicles employed in cleaning the streets of disagreeable substances, except where (at Natchez for instance), the number of these expecting parasites is so great that all the refuse of the town, within their reach, is insufficient: they then are seen following the scavengers' cart, hopping, flying, and alighting all about it, amidst grunting hogs and snarling dogs, until the contents, having reached a place of destination outside the suburbs, are deposited, and swallowed by them.
Whilst taking a view of this city from her lower ancient fort, I have for several days seen exhibitions of this kind.
I do not think that the vultures thus attached to cities are so much inclined to multiply as those more constantly resident in the forests, perceiving the diminution of number during the breeding season, and having remarked that many individuals known to me by particular marks made on them, and a special cast of countenance, were positively constant residents of town. The Vultur Aura is by no means so numerous as the atratus. I have seldom seen more than from twenty-five to thirty together; when, on the contrary, the latter are frequently associated to the number of an hundred.
The Vultur Aura is a more retired bird in habits, and more inclined to feed on dead game, snakes, lizards, frogs, and the dead fish that frequently are found about the sand-flats of rivers and borders of the sea-shore; is more cleanly in its appearance; and, as you will see by the difference in the drawings of both species, a neater and better formed bird. Its flight is also vastly superior in swiftness and elegance, requiring but a few flaps of its large wings to raise itself from the ground; after which it will sail for miles by merely turning either on one side or the other, and using its tail so slowly, to alter its course, that a person looking at it, whilst elevated and sailing, would be inclined to compare it to a machine fit to perform just a certain description of evolutions. The noise made by the vultures through the air, as they glide obliquely towards the earth, is often as great as that of our largest hawks, when falling on their prey; but they never reach the ground in this manner, always checking when about 100 yards high, and going several rounds, to examine well the spot they are about to alight on. The Vultur Aura cannot bear cold weather well; the few who, during the heat of summer, extend their excursions to the middle or northern states, generally return at the approach of winter; and I believe also, that very few of these birds breed east of the pine swamps of New Jersey. They are much attached to particular roosting-trees, and I know will come to them every night from a great distance. On alighting on these, each of them, anxious for a choice of place, creates always a general disturbance; and often, when quite dark, their hissing is heard in token of this inclination for supremacy. These roosting-trees of the Buzzards are generally in deep swamps, and mostly in high dead cypress trees; frequently, however, they roost with the carrion crows (Vultur atratus), and then it is on the largest dead timber of our fields, not unfrequently near the houses. Sometimes, also, this bird will roost close to the body of a thickly leaved tree: in such a position I have killed several when hunting wild turkeys by moonlight, mistaking them for these latter birds.
In Mississippi, Louisiana, Georgia, and Carolina, they prepare to breed early in the month of February, in common with most of the genus Falco. The most remarkable habit attached to their life is now to be seen: they assemble in parties of eight or ten, sometimes more, on large fallen logs, males and females, exhibiting the strongest desire to please mutually, and forming attachments in the choice of a mate, when each male, after many caresses, leads his partner off on the wing from the group, neither to mix nor associate with any more, until their offspring are well able to follow them in the air; after which, and until incubation takes place (about two weeks), they are seen sailing side by side the whole day.
These birds form no nest, yet are very choice respecting the place of deposit for their two eggs. Deep in the swamps, but always above the line of overflowing water-mark, a large hollow tree is sought, either standing or fallen, and the eggs are dropped on the mouldering particles inside, sometimes immediately near the entrance, at other times as much as twenty feet within. Both birds alternately incubate, and each feeds the other, by disgorging the contents of the stomach, or part of them, immediately before the bird that is sitting. Thirty-two days are required to bring forth the young from the shell; a thick down covers them completely; the parents, at that early period, and indeed for nearly two weeks, feed them by disgorging food considerably digested from their bills, in the manner of the common pigeons. The down acquires length, becomes thinner, and of a darker tint as the bird grows older. The young vultures, at three weeks, are large for their age, weighing then upwards of a pound, but extremely clumsy and inactive; unable to keep up their wings, then partly covered by large pin feathers, dragging them almost upon the ground, and bearing their whole weight on the full length of their legs and feet.
If approached at that time by a stranger or enemy, they hiss with a noise resembling that made by a strangling cat or fox, swell themselves, and hop sideways as fast as in their power. The parents, while sitting, and equally disturbed, act in the same manner; fly only a very short distance, waiting there the departure of the offender, to resume their duty. As the young grow larger, the parents simply throw their food before them; and, with all their exertions, seldom bring their offspring fat to the field. Their nests become so fetid, before the final departure of the young birds, that a person forced to remain there half an hour would be in danger of suffocation.
I have been frequently told, that the same pair will not abandon their first nest or place of deposit, unless broken up during incubation. This would attach to the vulture a constancy of affection that I cannot believe exists; as I do not think that pairing, in the manner described, is of any longer duration than the necessitous call of nature for the one season; and again, were they so inclined, they would never congregate in the manner they do, but would go in single pairs all their lives like eagles.
Vultures do not possess, in any degree, the power of bearing off their prey as falcons do, unless it be slender portions of entrails hanging by the bill. When chased by others from a carcass, it even renders them very awkward in their flight, and forces them to the earth again almost immediately.
Many persons in Europe believe that Buzzards prefer putrid flesh to any other. This is a mistake. Any flesh that they can at once tear with their very powerful bill in pieces, is swallowed, no matter how fresh. What I have said of their killing and devouring young animals, affords sufficient proofs of this; but it frequently happens that these birds are compelled to wait until the hide of their prey will yield to the bill. I have seen a large dead alligator, surrounded by vultures and carrion crows, of which nearly the whole of the flesh was so completely decomposed before these birds could perforate the tough skin of the monster, that, when at last it took place, their disappointment was apparent, and the matter, in an almost fluid state, abandoned by the vultures."