Argentine Ornithology Volume Ii Part 15

It lays four eggs, large for the size of the bird, oval in shape, and white in colour, thickly blotched with dull red.

The preying habits of the Little Kestrel are similar to those of the Orange-chested Hobby; it haunts farm-houses and plantations, and spends a great deal of time perched on some elevation watching for its prey, and making sudden dashes to capture it by surprise. But though not bold when seeking its food, it frequently makes violent unprovoked attacks on species very much larger than itself, either from ill-temper or in a frolicsome spirit, which is more probable.

Thus I have seen one drive up a flock of Glossy Ibises and pursue them some distance, striking and buffeting them with the greatest energy. I saw another pounce down from its perch, where it had been sitting for some time, on a female skunk quietly seated at the entrance of her burrow, with her three half-grown young frolicking around her. I was watching them with intense interest, for they were leaping over their parent's tail, and playing like kittens with it, when the Hawk dashed down, and after striking at them quickly three or four times, as they tumbled pell-mell into their kennel, flew quietly away, apparently well satisfied with its achievement.

306. ELa.n.u.s LEUCURUS (Vieill.).

(WHITE-TAILED KITE.)

+Ela.n.u.s leucurus+, _Scl. et Salv. Nomencl._ p. 121; _iid. P. Z. S._ 1869, p. 160 (Buenos Ayres); _Durnford, Ibis_, 1877, p. 188 (Buenos Ayres); _White, P. Z. S._ 1882, p. 623 (Buenos Ayres); _Barrows, Auk_, 1884, p. 111 (Entrerios); _Doring, Exp. al Rio Negro_, p. 50 (Pampas); _Sharpe, Cat. B._ i. p. 339; _Withington, Ibis_, 1888, p. 470 (Lomas de Zamora).

_Description._--Above grey; lesser wing-coverts and scapulars black; tail white, two central rectrices grey: beneath white; bill black; feet yellow; claws yellow: whole length 145 inches, wing 110, tail 70. _Female_ similar, but rather larger.

_Hab._ Central and South America.

This interesting Hawk is found throughout the Argentine Republic, but is nowhere numerous. It also inhabits Chili, where, Gay says, it is called _Bailarin_ (dancer) on account of its aerial performances. It is a handsome bird, with large ruby-red irides, and when seen at a distance its snow-white plumage and buoyant flight give it a striking resemblance to a gull. Its wing-power is indeed marvellous. It delights to soar, like the Martens, during a high wind, and will spend hours in this sport, rising and falling alternately, and at times, seeming to abandon itself to the fury of the gale, is blown away like thistle-down, until, suddenly recovering itself, it shoots back to its original position.

Where there are tall poplar trees these birds amuse themselves by perching on the topmost slender twigs, balancing themselves with outspread wings, each bird on a separate tree, until the tree-tops are swept by the wind from under them, when they often remain poised almost motionless in the air, until the twigs return to their feet.

When looking out for prey, this Kite usually maintains a height of sixty or seventy feet above the ground, and in its actions strikingly resembles a fishing gull, frequently remaining poised in the air with body motionless and wings rapidly vibrating for fully half a minute at a stretch, after which it flies on or dashes down upon its prey.

The nest is placed on the topmost twigs of a tall tree, and is round and neatly built of sticks, rather deep, and lined with dry gra.s.s. The eggs are eight in number, nearly spherical, the ground-colour creamy white, densely marked with longitudinal blotches or strips of a fine rich red, almost like coagulated blood in hue. There is, however, great variety in the shades of the red, also in the disposition of the markings, these in some eggs being confluent, so that the whole sh.e.l.l is red. The sh.e.l.l is polished and exceedingly fragile, a rare thing in the eggs of a raptor.

An approach to the nest is always greeted by the birds with long distressful cries, and this cry is also muttered in the love-season, when the males often fight and pursue each other in the air. The old and young birds sometimes live together until the following spring.

307. ROSTRHAMUS SOCIABILIS (Vieill.).

(SOCIABLE MARSH-HAWK.)

+Rostrhamus sociabilis+, _Scl. et Salv. Nomencl._ p. 121; _iid. P. Z.

S._ 1869, p. 160 (Buenos Ayres); _Durnford, Ibis_, 1877, p. 188 (Buenos Ayres); _Gibson, Ibis_, 1879, p. 413 (Buenos Ayres); _Withington, Ibis_, 1888, p. 470 (Lomas de Zamora). +Rostrhamus leucopygus+, _Sharpe, Cat. B._ i. p. 328. +Rostrhamus hamatus+, _Burm. La-Plata Reise_, ii. p. 435 (Rio Parana).

_Description._--Blackish slate-colour; head and wing-feathers black; rump white; tail white, with a broad band occupying the apical half, but leaving the tail end greyish; bill orange, apical half black; feet orange-brown, claws black: whole length 170 inches, wings 130, tail 75. _Female_ similar, but rather larger.

_Hab._ South America.

This Hawk in size and manner of flight resembles a Buzzard, but in its habits and the form of its slender and very sharply hooked beak it differs widely from that bird. The name of Sociable Marsh-Hawk, which Azara gave to this species, is very appropriate, for they invariably live in flocks of from twenty to a hundred individuals, and migrate and even breed in company. In Buenos Ayres they appear in September and resort to marshes and streams abounding in large water-snails (_Ampullaria_), on which they feed exclusively. Each bird has a favourite perch or spot of ground to which it carries every snail it captures, and after skilfully extracting the animal with its curiously modified beak, it drops the sh.e.l.l on the mound. When disturbed or persecuted by other birds they utter a peculiar cry, resembling the shrill neighing of a horse. In disposition they are most peaceable, and where they are abundant all other birds soon discover that they are not as other Hawks are and pay no attention to them. When soaring, which is their favourite pastime, the flight is singularly slow, the bird frequently remaining motionless for long intervals in one place; but the expanded tail is all the time twisted about in the most singular manner, moved from side to side, and turned up until its edge is nearly at a right angle with the plane of the body. These tail-movements appear to enable it to remain stationary in the air without the rapid vibratory wing-motions practised by _Ela.n.u.s leucurus_ and other hovering birds; and I should think that the vertebrae of the tail must have been somewhat modified by such a habit.

Concerning its breeding-habits Mr. Gibson writes:--"In the year 1873 I was so fortunate as to find a breeding colony in one of our largest and deepest swamps. There were probably twenty or thirty nests, placed a few yards apart, in the deepest and most lonely part of the whole 'canadon.'

They were slightly built platforms, supported on the rushes and two or three feet above the water, with the cup-shaped hollow lined with pieces of gra.s.s and water-rush. The eggs never exceeded three in a nest; the ground-colour generally bluish white, blotched and clouded very irregularly with dull red-brown, the rufous tint sometimes being replaced with ash-grey."

308. SPIZIAPTERYX CIRc.u.mCINCTUS (Kaup).

(SPOT-WINGED FALCON.)

+Falco circ.u.mcinctus+, _Scl. Ibis_, 1862, p. 23, pl. ii.

+Spiziapteryx circ.u.mcinctus+, _Scl. et Salv. Nomencl._ p. 122; _White, P. Z. S._ 1882, p. 623 (Catamarca); _Sharpe, Cat. B._ i.

p. 371. +Falco punctipennis+, _Burm. J. f. O._ 1860, p. 242.

+Hemiierax circ.u.mcinctus+, _Burm. La-Plata Reise_, ii. p. 438.

_Description._--Above brown, with black shaft-stripes; head black, with brown stripes and white superciliaries, which join round the nape, forming an ill-defined nuchal band; rump pure white; wings black, with white oval spots on the outer and white bars on the inner webs; tail black, all the lateral rectrices crossed by five or six broad white bars: beneath white, breast regularly striped with narrow black shaft stripes; bill plumbeous, lower mandible yellow, except at the tip; feet greenish, nails black: whole length 11 inches, wing 65, tail 50. _Female_ similar, but rather larger.

_Hab._ Argentina.

This small Hawk is sometimes met with in the woods of La Plata, near the river; it is rare, but owing to its curious violent flight, with the short blunt wings rapidly beating all the time, it is very conspicuous in the air and well known to the natives, who call it _Rey de los Pajaros_ (King of the Birds), and entertain a very high opinion of its courage and strength. I have never seen it taking its prey, and do not believe that it ever attempts to capture anything in the air, its short blunt wings and peculiar manner of flight being unsuited for such a purpose. Probably it captures birds by a sudden dash when they mob it on its perch; and I do not know any raptor more persistently run after and mobbed by small birds. I once watched one for upwards of an hour as it sat on a tree attended by a large flock of Guira Cuckoos, all excitedly screaming and bent on dislodging it from its position. So long as they kept away five or six feet from it the Hawk remained motionless, only hissing and snapping occasionally as a warning; but whenever a Cuckoo ventured a little nearer and into the charmed circle, it would make a sudden rapid dash and buffet the intruder violently back to a proper distance, returning afterwards to its own stand.

309. MILVAGO CHIMANGO (Vieill.).

(CHIMANGO CARRION-HAWK.)

+Milvago chimango+, _Scl. et Salv. Nomencl._ p. 122; _Durnford, Ibis_, 1877, p. 40 (Chupat), et p. 188 (Buenos Ayres), et 1878, p. 398 (Centr. Patagonia); _Gibson, Ibis_, 1879, p. 420 (Buenos Ayres); _Barrows, Auk_, 1884, p. 111 (Entrerios); _Withington, Ibis_, 1888, p. 470 (Lomas de Zamora). +Ibycter chimango+, _Sharpe, Cat. B._ i. p. 41. +Milvago pezoporus+, _Burm. La-Plata Reise_, ii. p. 434 (La Plata).

_Description._--Above reddish brown, with ashy edgings to the feathers; rump greyish white; greater wing-coverts white, with slight brown cross bars; primaries dark brown, externally at their bases freckled with grey; inner webs at their bases white; tail greyish white, with numerous freckles and narrow bands of brownish grey: beneath grey, deeply tinged with rufous on the throat and breast; crissum nearly white; under wing-coverts deep rufous; bill pale yellowish; feet olive: whole length 150 inches, wing 110, tail 65. _Female_ similar.

_Hab._ Southern half of South America.

Azara says of the Carancho (_Polyborus tharus_):--"All methods of subsistence are known to this bird: it pries into, understands, and takes advantage of everything." These words apply better to the Chimango, which has probably the largest bill of fare of any bird, and has grafted on to its own peculiar manner of life the habits of twenty diverse species. By turns it is a falcon, a vulture, an insect-eater, and a vegetable-eater. On the same day you will see one bird in violent hawk-like pursuit of its living prey, with all the instincts of rapine hot within it, and another less ambitious individual engaged in laboriously tearing at an old cast-off shoe, uttering mournful notes the while, but probably more concerned at the tenacity of the material than at its indigestibility.

A species so cosmopolitan in its tastes might have had a whole volume to itself in England; being only a poor foreigner, it has had no more than a few unfriendly paragraphs bestowed upon it. For it happens to be a member of that South-American subfamily of which even grave naturalists have spoken slightingly, calling them vile, cowardly, contemptible birds; and the Chimango is nearly least of them all--a sort of poor relation and hanger on of a family already looked upon as bankrupt and disreputable. Despite this evil reputation, few species are more deserving of careful study; for throughout an extensive portion of South America it is the commonest bird we know; and when we consider how closely connected are the lives of all living creatures by means of their interlacing relations, so that the predominance of any one kind, however innocuous, necessarily causes the modification, or extinction even, of surrounding species, we are better able to appreciate the importance of this despised fowl in the natural polity. Add to this its protean habits, and then, however poor a creature our bird may seem, and deserving of strange-sounding epithets from an ethical point of view, I do not know where the naturalist will find a more interesting one.

The Chimango has not an engaging appearance. In size and figure it much resembles the Hen-harrier, and the plumage is uniformly of a light sandy brown colour; the shanks are slender, claws weak, and beak so slightly hooked that it seems like the merest apology of the Falcon's tearing weapon. It has an easy loitering flight, and when on the wing does not appear to have an object in view, like the Hawk, but wanders and prowls about here and there, and when it spies another bird it flies after him to see if he has food in his eye. When one finds something to eat the others try to deprive him of it, pursuing him with great determination all over the place; if the foremost pursuer flags, a fresh bird takes its place, until the object of so much contention--perhaps after all only a bit of skin or bone--is dropped to the ground, to be instantly s.n.a.t.c.hed up by some bird in the tail of the chase; and he in turn becomes the pursued of all the others. This continues till one grows tired and leaves off watching them without seeing the result. They are loquacious and sociable, frequently congregating in loose companies of thirty or forty individuals, when they spend several hours every day in spirited exercises, soaring about like Martins, performing endless evolutions, and joining in aerial mock battles. When tired of these pastimes they all settle down again, to remain for an hour or so perched on the topmost boughs of trees or other elevations; and at intervals one bird utters a very long leisurely chant, with a falling inflection, followed by a series of short notes, all the other birds joining in chorus and uttering short notes in time with those of their soloist or precentor. The nest is built on trees or rushes in swamps, or on the ground amongst gra.s.s and thistles. The eggs are three or four in number, nearly spherical, blotched with deep red on a white or creamy ground; sometimes the whole egg is marbled with red; but there are endless varieties. It is easy to find the nest, and becomes easier when there are young birds, for the parent when out foraging invariably returns to her young uttering long mournful notes, so that one has only to listen and mark the spot where it alights. After visiting a nest I have always found the young birds soon disappear, and as the old birds vanish also I believe that the Chimango removes its young when the nest has been discovered--a rare habit with birds.

Chimangos abound most in settled districts, but a prospect of food will quickly bring numbers together even in the most solitary places. On the desert pampas, where hunters, Indian and European, have a great fancy for burning the dead gra.s.s, the moment the smoke of a distant fire is seen there the Chimangos fly to follow the conflagration. They are, at such times, strangely animated, dashing through clouds of smoke, feasting amongst the hot ashes on roasted cavies and other small mammals, and boldly pursuing the scorched fugitives from the flames.

At all times and in all places the Chimango is ever ready to pounce on the weak, the sickly, and the wounded. In other regions of the globe these doomed ones fall into the clutches of the true bird of prey; but the salutary office of executioner is so effectually performed by the Chimango and his congeners where these false Hawks abound, that the true Hawks have a much keener struggle to exist here. This circ.u.mstance has possibly served to make them swifter of wing, keener of sight, and bolder in attack than elsewhere. I have seen a Buzzard, which is not considered the bravest of the Hawks, turn quick as lightning on a Cayenne Lapwing, which was pursuing it, and grappling it bear it down to the ground and despatch it in a moment, though a hundred other Lapwings were uttering piercing screams above it. Yet this Plover is a large, powerful, fierce-tempered bird, and armed with sharp spurs on its wings.

This is but one of numberless instances I have witnessed of the extreme strength and daring of our Hawks.

When shooting birds to preserve I used to keep an anxious eye on the movements of the Chimangos flying about, for I have had some fine specimens carried off or mutilated by these omnipresent robbers. One winter day I came across a fine _Myiotheretes rufiventris_, a pretty and graceful Tyrant-bird, rather larger than the Common Thrush, with a chocolate and silver-grey plumage. It was rare in that place, and, anxious to secure it, I fired a very long shot, for it was extremely shy. It rose up high in the air and flew off apparently unconcerned.

What, then, was my surprise to see a Chimango start off in pursuit of it! Springing on to my horse, I followed, and before going half a mile noticed the Tyrant-bird beginning to show signs of distress. After avoiding several blows aimed by the Chimango, it flew down and plunged into a cardoon bush. There I captured it, and when skinning it to preserve found that one small shot had lodged in the fleshy portion of the breast. It was a very slight wound, yet the Chimango with its trained sight had noticed something wrong with the bird from the moment it flew off, apparently in its usual free buoyant manner.

On another occasion I was defrauded of a more valuable specimen than the Tyrant-bird. It was on the east coast of Patagonia, when one morning, while seated on an elevation, watching the waves dashing themselves on the sh.o.r.e, I perceived a shining white object tossing about at some distance from land. Successive waves brought it nearer, till at last it was caught up and flung far out on to the shingle, fifty yards from where I sat; and instantly, before the cloud of spray had vanished, a Chimango dashed down upon it. I jumped up and ran down as fast as I could, and found my white object to be a Penguin, apparently just killed by some accident out at sea, and in splendid plumage; but, alas! in that moment the vile Chimango had stripped off and devoured the skin from its head, so that as a specimen it was hopelessly ruined.

As a rule, strong healthy birds despise the Chimango; they feed in his company; his sudden appearance causes no alarm, and they do not take the trouble to persecute him; but when they have eggs or young he is not to be trusted. He is not easily turned from a nest he has once discovered. I have seen him carry off a young Tyrant-bird (_Milvulus tyrannus_), in the face of such an attack from the parent birds that one would have imagined not even an Eagle could have weathered such a tempest. Curiously enough, like one of the boldest of our small Hawks (_Tinnunculus cinnamominus_), they sometimes attack birds so much too strong and big for them that they must know the a.s.sault will produce more annoyance than harm. I was once watching a flock of Coots feeding on a gra.s.sy bank, when a pa.s.sing Chimango paused in its flight, and, after hovering over them a few moments, dashed down upon them with such impetuosity that several birds were thrown to the ground by the quick successive blows of its wings. There they lay on their backs, kicking, apparently too much terrified to get up, while the Chimango deliberately eyed them for some moments, then quietly flew away, leaving them to dash into the water and cool their fright. Attacks like these are possibly made in a sportive spirit, for the Milvago is a playful bird, and, as with many other species, bird and mammal, its play always takes the form of attack.

Its inefficient weapons compel it to be more timid than the Hawk, but there are many exceptions, and in every locality individual birds are found distinguished by their temerity. Almost any shepherd can say that his flock is subject to the persecutions of at least one pair of lamb-killing birds of this species. They prowl about the flock, and watch till a small lamb is found sleeping at some distance from its dam, rush upon it, and, clinging to its head, eat away its nose and tongue.

The shepherd is then obliged to kill the lamb; but I have seen many lambs that have been permitted to survive the mutilation, and which have grown to strong, healthy sheep, though with greatly disfigured faces.

One more instance I will give of the boldness of a bird of which Azara, greatly mistaken, says that it might possibly have courage enough to attack a mouse, though he doubts it. Close to my house, when I was a boy, a pair of these birds had their nest near a narrow path leading through a thicket of giant thistles, and every time I traversed this path the male bird, which, contrary to the rule with birds of prey, is larger and bolder than the female, would rise high above me, then dashing down, strike my horse a violent blow on the forehead with its wings. This action it would repeat till I was out of the path.

I thought it very strange the bird never struck _my_ head; but I presently discovered that it had an excellent reason for what it did. The gauchos ride by preference on horses never properly tamed, and one neighbour informed me that he was obliged every day to make a circuit of half a mile round the thistles, as the horses he rode became quite unmanageable in the path, they had been so terrified with the attacks of this Chimango.

Where the intelligence of the bird appears to be really at fault is in its habit of attacking a sore-backed horse, tempted thereto by the sight of a raw spot, and apparently not understanding that the flesh it wishes to devour is an inseparable part of the whole animal. Darwin has noticed this curious blunder of the bird; and I have often seen a chafed saddle-horse wildly scouring the plain closely pursued by a hungry Chimango determined to dine on a portion of him.

In the hot season, when marshes and lagoons are drying up, the Chimango is seen a.s.sociating with Ibises and other waders, standing knee-deep in the water and watching for tadpoles, frogs, and other aquatic prey. He also wades after a very different kind of food. At the bottom of pools, collected on clayey soil after a summer shower, an edible fungus grows of a dull greenish colour and resembling gelatine. He has found out that this fungus is good for food, though I never saw any other creature eating it. In cultivated districts he follows the plough in company with the black-headed gulls, Molothri, Guira cuckoos, and tyrant-birds, and clumsily gleans amongst the fresh-turned mould for worms and larvae. He also attends the pigs when they are rooting on the plain to share any succulent treasure-trove turned up by their snouts; for he is not a bird that allows dignity to stand between him and his dinner. In the autumn, on damp, sultry days, the red ants, that make small conical mounds on the pampas, are everywhere seen swarming. Rising high in the air they form a little cloud or column, and hang suspended for hours over the same spot. On such days the Milvagos fare sumptuously on little insects, and under each cloud of winged ants several of them are to be seen in company with a few Flycatchers, or other diminutive species, briskly running about to pick up the falling manna, their enjoyment undisturbed by any sense of incongruity.

Before everything, however, the Chimango is a vulture, and is to be found at every solitary rancho sharing with dogs and poultry the offal and waste meat thrown out on the dust-heap; or, after the flock has gone to pasture, tearing at the eyes and tongue of a dead lamb in the sheepfold. When the hide has been stripped from a dead horse or cow on the plains, the Chimango is always first on the scene. While feeding on a carca.s.s it incessantly utters a soliloquy of the most lamentable notes, as if protesting against the hard necessity of having to put up with such carrion fare--long, querulous cries, resembling the piteous whines of a shivering puppy chained up in a bleak backyard and all its wants neglected, but infinitely more doleful in character. The gauchos have a saying comparing a man who grumbles at good fortune to the Chimango crying on a carca.s.s; an extremely expressive saying to those who have listened to the distressful wailings of the bird over its meat.

In winter a carca.s.s attracts a great concourse of the Black-backed Gulls; for with the cold weather these vultures of the sea abandon their breeding-places on the Atlantic sh.o.r.es to wander in search of food over the vast inland pampas. The dead beast is quickly surrounded by a host of them, and the poor Chimango crowded out. One at least, however, is usually to be seen perched on the carca.s.s tearing at the flesh, and at intervals with outstretched neck and ruffled up plumage uttering a succession of its strange wailing cries, reminding one of a public orator mounted on a rostrum and addressing harrowing appeals to a crowd of attentive listeners. When the carca.s.s has been finally abandoned by foxes, armadillos, gulls, and caracaras, the Chimango still clings sorrowfully to it, eking out a miserable existence by tearing at a fringe of gristle and whetting his hungry beak on the bones.