Part 20

The LYRE-TAILED NIGHT JAR (_Hydropsalis forcipata_), as the species with which we are most familiar has been called, is spotted with brown and yellow upon its body, the centre of the throat being white. The exterior tail-feathers of this beautiful bird are from twenty-six to twenty-eight inches long, while the body does not exceed seven, and the wing nine inches. According to Azara, the Lyre-tailed Night Jar is somewhat rarely met with, as it usually frequents the inmost recesses of the vast forests of South America. Its scientific name, _Hydropsalis_, has been derived from the fact that like other Night Swallows it flies close to the water when passing over the lakes or rivers in search of food.

Some Goatsuckers have certain feathers of their wings so remarkably developed, that they have been called by the Arabs "_the four-winged birds_," and are described by Swainson under the name of MACRODIPTERYX.

THE LONG-WINGED MACRODIPTERYX.

The LONG-WINGED MACRODIPTERYX (_Macrodipteryx longipennis_) has the tail of moderate size, and straight at its extremity; the foot resembles that of the European species; the beak is delicate and furnished with long bristles at its base. The plumage of the _male_ bird is characterised by the long appendages which grow between the primary and secondary quills. These appendages, or rather shafts, are frequently seventeen inches long, entirely bare to within six inches of the extremity, where the web grows upon both sides and forms a broad expansion. The wing of the female is entirely without this remarkable structure. The plumage, which is somewhat dusky, is a mixture of red and black; the throat is paler, and the nape decorated with a yellowish tint; the primaries are striped black and red, with a dark tip; the secondaries are black with four red stripes. The centre tail-feathers are grey, spotted and streaked with black. The length of these birds is about five inches: the tail measures from three and a half to four, and the wing six inches and three-quarters.

THE STREAMER-BEARING NIGHT JAR OR "FOUR WINGS."

The STREAMER-BEARING NIGHT JAR, or "FOUR WINGS" (_Cosmetornis vexillarius_), is another remarkable species, closely allied to that above described, but distinguished by the development, not of one only, but of two excessively long feathers, that grow from each wing. These peculiar appendages are furnished with a web upon both sides, extending throughout their entire length. We are entirely without particulars as to the life and habits of this extremely rare bird, which inhabits South-eastern Africa.

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All the various groups of Goatsuckers whose outward appearance we have thus briefly described frequent woodland districts or forests, in the immediate neighbourhood of large plains and open fields, as such localities abound with the insects on which they mainly rely for nourishment. Still there are exceptions. The Red-throated Goatsucker, for example, is most frequently seen upon rocks slightly overgrown with trees or shrubs, and though it builds in various situations, prefers plantations of olive-trees, when about to make its nest, whilst the Cream-coloured Night Jar (_Caprimulgus isabellinus_), on the contrary, usually conceals itself amidst the bushes or grass that cover the sandy banks of the Nile. During the day most species seek a shady retreat, and either sit upon the ground whilst reposing, or find shelter upon trees, on the boughs of which they recline, not after the manner of other birds, but in such a position as to allow the entire body to _lie_ along the supporting branch, holding themselves, meanwhile, firmly in place by means of their inner toes, and the serrated claw, with which the central toe is furnished; it is only when disturbed from their slumbers that the Goatsuckers perch in the ordinary manner; as soon as the supposed danger is over, they at once resume their favourite attitude. Whilst asleep the eyelids are kept completely closed, but if suddenly awakened, these birds blink, and peer around them, after the fashion of an Owl, and seek to conceal themselves by lying close to the earth, or to the tree on which they are reposing. Upon the ground they move with much difficulty; indeed, it has often been stated that their feet are useless as a means of progression, but this is not the case, as we have on several occasions seen the African Goatsuckers walk some little distance when passing from one resting-place to another. The flight of all these various groups is unsteady and apparently aimless during the day, but at sunset they seem endowed with new life, and may be seen alternately skimming and hovering over the face of the country, in pursuit of moths, beetles, and various other insects, upon which they subsist. When their appetite is appeased, they rest for a time upon some branch, and then sally forth again before morning dawns to procure a second repast. It is not uncommon for the Goatsuckers to wander to a very considerable distance from their usual haunts during these nocturnal excursions, and even approach the immediate vicinity of towns and villages; nay, so inquisitive and bold are they in regard to the objects they meet with whilst in search of prey, that they will often follow and hover round a man or a dog for a quarter of an hour at a time. During the breeding season their flight becomes still more varied and beautiful, and the birds themselves seem roused to a higher degree of intelligence than is observable at other times; such species especially, as possess the remarkably long wings or tails we have described, cannot fail to impress those who are fortunate enough to see them gliding or hovering aloft, with their flowing plumage alternately closed or outspread, as they perform their light and elegant gyrations through the realms of air. Russegger describes the African "Four Wings" as looking like some strange being from another world, as it whirls along, at one moment appearing to multiply itself by rapidly assuming the most various attitudes, or revolving like a shuttlecock, with its long feathers streaming and twisting in the wind. The voices of these various birds differ very considerably; some species uttering a harsh, droning note, not unlike the sound of a spinning-wheel (whence is derived their name of "Night Jar," or "Night Churr"), whilst others are capable of producing by no means inharmonious tones. The European Goatsucker, when alarmed, purrs very much like a cat, and during the breeding season attracts the attention of its mate by two distinct notes; at other times its cry may be represented by the syllables, "Dak, dak," faintly and hoarsely uttered. So dismal and unearthly are the voices of some American Night Jars, that Schomburghk tell us that neither Indians, Creoles, nor Negroes would venture to shoot one of them, regarding them as direct embodiments of, or emissaries from, the various evil spirits and enchanters, of whose machinations and spells the ignorant natives live in constant dread.

"A Goatsucker," says Waterton, "inhabits Demerara, about the size of an English Wood Owl, whose voice is so remarkable that when once heard it is not to be easily forgotten. A stranger would never believe it to be the cry of a bird, but would say it was the departing voice of a midnight murdered victim, or the last wailing of poor Niobe for her children, before she was turned to stone. Suppose a person in hopeless sorrow, beginning with a loud note, 'Ha, ha; ha, ha; ha, ha, ha;' each note lower and lower, till the last is scarcely heard, pausing a moment between each exclamation, and you will have some idea of the moaning of the Great Goatsucker of Demerara. Other species articulate some words so distinctly that they have received their names from the sentences they utter, and absolutely bewilder a stranger on his arrival in their vicinity. One sits down close to your door, or flies and alights three or four yards before you as you walk along the road, crying, 'Who are you? who, who are you?' Another bids you 'Work away; work, work, work away!' A third cries mournfully, 'Willy, come go; Willy, Willy, Willy, come go!' and a fourth tells him to 'Whip-poor-Will, Whip-poor-Will!' in tones wonderfully clear and startling."

As regards their instincts and capabilities, the nocturnal Goatsuckers are far behind the diurnal members of their family, and exhibit so little sense of self-preservation, as constantly to expose themselves to great danger. We have frequently, whilst camping out in Africa, whenever we have kindled a fire, been visited by numbers of these birds, apparently quite regardless of the risk they ran of being brought down by our gun. In Spain, however, the Goatsuckers appear to be somewhat more on the alert; indeed, owing to their supposed dexterity in evading pursuit, they are there called by the peasantry _Engaña Pastor_, or "Shepherd Deceivers," as that class of men come most in contact with these birds, whilst tending their flocks; not from the absurd reason that has obtained such universal credence, but because these much-maligned visitants perform a most invaluable service both to the farmer and his cattle.

"When the moon shines brightly," Waterton continues, "you may have a fair opportunity of examining the Goatsucker; you will see it close by the cows, goats, and sheep, jumping up every now and then under their bellies. Approach a little nearer; he is not shy; 'he fears no danger, for he knows no sin.' See how the nocturnal flies are tormenting the poor kine, and with what dexterity he springs up and catches them, as fast as they alight on the belly, legs, and udders of the poor animals. Observe how quietly they stand, and how sensible they seem of his good offices; for they neither strike at him, nor try to drive him away as an uncivil intruder. Were you to dissect him, and inspect his stomach, you would find no milk there; it is full of the flies that have been annoying the herd."

All Night Jars breed but once in the year, and that always during the spring-time of their native lands. No nest is built, the parents contenting themselves with any retired, shady nook, when about to deposit their eggs. Towards their young, both parents exhibit great attachment and devotion, and will exert every effort to entice any approaching stranger from the little family. Many strange tales have been circulated as to the manner in which their eggs are conveyed from one place to another, in time of danger, and on this point we may now venture to speak with authority, having been fortunate enough to be an eye-witness to the whole proceeding. Upon the occasion to which we refer, a pair of Night Jars which we purposely disturbed, appeared to be overcome with fear for the space of a minute, then, suddenly recovering themselves, they each seized an egg in their capacious beaks, and bore it carefully and gently away, flying so near the ground as almost to touch it with their feet. Both parents assist in the labour of incubation, and continue to sit, even after the nestlings have left the shell, in order to keep them warm: according to some authorities, this practice is continued until they are almost fledged. The young are fed during the night, and reared upon a variety of insect food. When taken from the nest, they thrive and grow rapidly, if provided with a plentiful supply of flies.

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The GIANT GOATSUCKERS (_Nyctibius_) constitute another South American group, easily recognisable by their strongly-hooked beak, heavy foot, the central toe of which has no serrated claw, powerful body, and large head. The wings (in which the third quill exceeds the rest in length) are long and pointed, the tail long, and slightly rounded, and the plumage rich, soft, and lax. The beak is very peculiar in its formation, and appears triangular when seen from above; the upper mandible is extremely broad at its base, sloping gently downwards as far as the nostrils, from which point it becomes thin, round, compressed, and curves gently over the lower mandible, which is also slightly bent at its tip, and somewhat shorter than the upper portion. The sharp edges of the beak have a tooth-like appendage, about one line in length, placed just where it begins to curve. The jaws open almost to the ears, and the gape is therefore enormous. The horny portion of the bill is almost entirely concealed from view by a growth of feathers intermixed with bristles, which covers the upper mandible, from the nostrils almost to the tip. The legs are short, the toes slender, and the claws comparatively strong and hooked. The central nail has a prominent ridge.

THE IBIJAU, OR EARTH-EATER.

The IBIJAU, or EARTH-EATER (_Nyctibius grandis_), is by far the largest member of this group. Its length, according to the Prince von Wied, exceeds twenty-one, and its breadth forty-seven inches; the wing measures fifteen inches and a half, and the tail ten inches and one-third. A whitish or greyish yellow predominates in the coloration of the plumage, which is darkest upon the upper portion of the body, and marked with a variety of fine brown and black lines; the head-feathers have dark streaks upon the shafts, and triangular spots at the tip. The edges of the wings and region of the shoulders are deep reddish brown, streaked with black, and intermixed with white spots upon the carpal joint; the under side is white, ornamented with curved brown lines, each feather being tipped with yellow, the quills are dark greyish brown, striped with a paler shade, and spotted with white upon the outer web, the tail-feathers are decorated with six or seven dark and light stripes, the throat is white, marked with brown, as is the breast, the latter is also streaked longitudinally with black; the hinder parts of the body are pure white; the beak and feet are yellowish grey, and the eyes dark blackish brown.

These large Goatsuckers, though by no means rare in South America, are not frequently seen, as they remain during the entire day ensconced at the summit of the most lofty trees, lying full length upon the thickly foliaged branches in the manner already described. So closely does their plumage resemble the bark of the trees on which they recline, that it is very difficult to detect their presence, and so extremely dull are some species that, as the Prince von Wied tells us, they allow themselves to be fired at repeatedly without attempting to stir, or will sit quietly and permit a snare to be thrown over their heads. We cease to wonder at such utter stupidity when we learn from the same source that though the body of these Swallows equals that of the Raven, their brain does not exceed a hazel-nut in size. Evening has no sooner set in than, like their congeners, they at once commence their search for moths and similar prey, in pursuit of which they soar to a very considerable height; and it is by no means rare to find the ground completely strewn with the wings of the enormous moths and butterflies which they attack and seize in their huge beaks. During the night their dismal cry is constantly heard, as one mate calls to the other; but when morning approaches they seek their favourite retreats. Burmeister tells us that the two eggs that constitute a brood are deposited in any slight cavity in the trees. Such as he obtained were oval in shape, with a lustreless, pure white shell, thickly covered with brown dots of various shades, most thickly strewn over one end.

THE GUACHERO, OR OIL BIRD.

The OIL BIRD (_Steatornis Caripensis_) has hitherto been classed among the Goatsuckers, but it differs so essentially from any other member of that family in its mode of life, that we have decided upon describing it entirely apart. The body of this remarkable species is slender, the head flat and broad; the wing, in which the third and fourth quills exceed the rest in length, though long and pointed, does not extend as far as the extremity of the well-developed tail. The beak is broad at its base, compressed in the middle, and terminates in a hook; its tip, moreover, is furnished with two denticulations; the gape extends to the eyes, but the lower mandible is feeble and considerably shorter than the upper part of the beak. The feet are so small as to be almost useless upon the ground: their soles are callous, and the tarsi without feathers; the front toes are all of equal size, entirely unconnected, and the short hinder toe is reversible. The plumage is extremely soft, almost silky, and the region of the beak is overgrown with long bristles; the large eyes are protected by heavy lids covered with long hairs. The gullet is not dilated into a crop, and the stomach is very muscular; the entrails are covered with a fatty layer of such thickness that they may be said to be embedded in fat. The plumage is of a beautiful reddish brown, deepest in shade upon the back; the head, breast, belly, wings, and tail are rust-red, marked with heart-shaped white spots, which are here and there surrounded by a black line. The eye is blueish black, the beak and feet horn-grey. The length of this species is about twenty-one inches, and its breadth about forty-two inches. Humboldt, who discovered this remarkable bird in 1799, found it living in the rocky caverns of Caripe, and more recent travellers have met with it in the dark clefts and fissures of rocks among the Andes.

"The Cueva del Guachero, or Cave of the Guacheros," as described by Humboldt, "is a vast fissure, pierced in the vertical profile of a rock, facing towards the south; and the rocks which surmount the grotto are covered with trees of immense height; succulent plants and orchidaceæ rise in the driest clefts, and plants waving in the wind hang in festoons at the entrance. Within the cave vegetation continues to the distance of forty paces. Daylight penetrates far into the grotto, but when the light begins to fail the hoarse voices of the inhabitants become audible, and it would be difficult to form an idea of the horrible noise occasioned by thousands of these birds in the dark parts of the cavern. Their shrill and piercing cries strike upon the vaults in the rocks, and are repeated by the subterranean echoes. The Indians showed us the nests of the Guacheros by fixing a torch to a long pole; these nests were fifty or sixty feet above our heads, in holes of the shape of funnels, with which the roof of the grotto is pierced like a sieve. The noise increased as we advanced, the birds becoming scared by the torches we carried, but when the din somewhat abated, immediately around us we heard at a distance the plaintive cries of others at roost in the ramifications of the cavern. It seemed as if different groups answered each other alternately. The Indians enter the Cueva del Guachero once a year, near Midsummer. They go armed with poles, with which they destroy the greater part of the nests. At that season several thousand birds are killed; and the old ones, as if to defend their brood, hover over the heads of the Indians, uttering terrible cries. The young, which fall to the ground, are opened on the spot. Their peritoneum is found extremely loaded with fat, and a layer of fat reaches from the abdomen to the vent, forming a kind of fatty cushion between the legs. At the period commonly called at Caripe the "oil harvest," the Indians build huts with palm leaves near the entrance and even in the porch of the cavern, where, with a fire of brushwood, they melt in pots of clay the fat of the young birds just killed. This fat is known by the name of butter or oil (_mantece_ or _aceite_) of the Guachero; it is half liquid, transparent, without smell, and so pure that it may be kept above a year without becoming rancid. At the convent of Caripe no other oil is used in the kitchen of the monks but that of the cavern, and we never observed that it gave the aliments a disagreeable taste or smell."

Funck, who also visited the cavern above described, states that the Guacheros leave their nests after darkness has completely closed in, and that their harsh, raven-like cry may then be heard as they fly about in quest of food. Fruit forms their usual nourishment, and this they will swallow, even if as large as a Pigeon's egg; but the seeds and kernels they reject as indigestible. The nest is constructed of clay, and the brood consists of from two to four eggs. Grosz also gives an account very similar to that of Humboldt respecting another stronghold of the Oil Birds, called the Ravine of Iconongo, that he visited in New Granada. This extensive nesting-place is about half a mile long, and from thirty to forty feet broad, and had to be entered by means of a rope let down from above. Grosz fortunately succeeded in obtaining many Guacheros, both dead and alive, and made valuable observations relative to their demeanour and habits. Their movements in the air, he tells us, are light and rapid, the pinions and tail during their flight being held fully expanded; upon the ground their gait is extremely awkward, their feet requiring assistance from the wings, even to sustain the creeping hobbling motion to which their progress when on _terra firma_ is restricted. Whilst thus attempting to walk the tail is slightly raised, and the head and neck bent forward in a constant succession of serpent-like movements, in order to maintain their balance. When perched they keep the body erect, supporting it slightly upon the wings, and hang the head droopingly. If much excited whilst in flight, the cry of the Guachero becomes positively unearthly, so dismally hideous are its tones. Both parents brood alternately upon the eggs, which, according to Grosz, are white and pear-shaped. No preparations whatever are made for the reception of the young family, the eggs being merely deposited in the clefts of the rocks. The nestlings, when first hatched, are extremely ugly and uncouth, and completely helpless until they are fully fledged; so extraordinarily voracious are they that, if other food is not on the spot, they will fall furiously upon each other, or even seize and drag at their own feet or wings.

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The OWL SWALLOWS (_Podargi_) constitute a family bearing considerable resemblance to the Night Jars, both in their general appearance and mode of life. These birds have a slender body and short neck; their head is broad and flat, their wings short and blunt, their tail long, their tarsi high and powerful. The beak, which opens farther back than the eyes, is large, flat at its base, and broader than the brow; the mandibles are hooked at the tip, of equal length, and smooth at the margin; the nostrils are situated at the base of the beak, and are almost entirely concealed beneath the feathers of the forehead. The foot is short, with three of the toes placed in front, and one pointing directly backwards; the latter is not reversible. The plumage is soft, and dusky in its coloration; the region of the beak, and, in some cases, that of the ear, is covered with a growth of bristles.

Such of these birds as we are at present acquainted with, inhabit the forests of Southern Asia, as also of New Holland and the neighbouring islands; but little has as yet been ascertained respecting their general habits, and we must therefore confine ourselves to the mention of those species with which we are best acquainted.

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