(GUIRA CUCKOO.)
Guira piririgua, Scl. et Salv. Nomencl. p. 107; Durnford, Ibis, 1877, p. 185 (Buenos Ayres); Gibson, Ibis, 1880, p. 8 (Buenos Ayres); White, P. Z. S. 1882, p. 619 (Buenos Ayres); Barrows, Auk, 1884, p. 26 (Entrerios); Withington, Ibis, 1888, p. 468 (Lomas de Zamora). Ptiloleptis guira, Burm. La-Plata Reise, ii. p. 443.
Description.—Above dark brown, with white shaft-stripes; head brown; wings reddish brown, passing into blackish brown on the outer secondaries; rump white; tail white, at the base ochraceous, crossed by a very broad black band, except the two central feathers, which are uniform brown: beneath sordid white, throat and upper breast with long linear black shaft-stripes; bill and feet yellow: whole length 15·0 inches, wing 7·0, tail 8·0. Female similar.
Hab. Brazil, Paraguay, and Argentina.
“Piririgua,” the specific term adopted by naturalists for this bird, is, according to Azara, the vernacular name of the species in Paraguay. He says that in that country it is abundant, but scarce in the Plata district. No doubt it has greatly increased and extended its range southwards during the hundred years which have elapsed since his time, as it is now very common in Buenos Ayres, where its vernacular name is Urraca (Magpie). In the last-named country it is not yet quite in harmony with its environment. Everywhere its habit is to feed exclusively on the ground, in spite of possessing feet formed for climbing; but its very scanty plumage, slow laborious flight, and long square tail, so unsuitable in cold boisterous weather, show that the species is a still unmodified intruder from the region of perpetual summer many degrees nearer to the equator.
The Guira Cuckoo is about sixteen inches long, has red eyes and blue feet, and an orange-red beak. The crown of the head is deep rufous, and the loose hair-like feathers are lengthened into a pointed crest. The back and rump are white, the wings and other upper parts very dark fuscous, marked with white and pale brown. Under surface dull white, with hair-like black marks on the throat and breast. The tail is square, 9 to 10 inches long; the two middle feathers dark brown, the others three-coloured—yellow at the base, the middle portion dark glossy green, the ends white; and when the bird is flying the tail, spread out like a fan, forms a conspicuous and beautiful object.
During the inclement winter of Buenos Ayres the Guira Cuckoo is a miserable bird, and appears to suffer more than any other creature from cold. In the evening the flock, usually composed of from a dozen to twenty individuals, gathers on the thick horizontal branch of a tree sheltered from the wind, the birds crowding close together for warmth, and some of them roosting perched on the backs of their fellows. I have frequently seen them roosting three deep, one or two birds at the top to crown the pyramid; but with all their huddling together a severe frost is sure to prove fatal to one or more birds in the flock; and sometimes several birds that have dropped from the branch stiff with cold are found under the trees in the morning. If the morning is fair the flock betakes itself to some large tree, on which the sun shines, to settle on the outermost twigs on the northern side, each bird with its wings drooping, and its back turned towards the sun. In this spiritless attitude they spend an hour or two warming their blood and drying the dew from their scanty dress. During the day they bask much in the sun, and towards evening may be again seen on the sunny side of a hedge or tree warming their backs in the last rays. It is owing, no doubt, to fecundity, and to an abundance of food that the Guira Cuckoo is able to maintain its existence so far south in spite of its terrible enemy the cold.
With the return of warm weather this species becomes active, noisy, and the gayest of birds; the flock constantly wanders about from place to place, the birds flying in a scattered desultory manner one behind the other, and incessantly uttering while on the wing a long complaining cry. At intervals during the day they also utter a kind of song, composed of a series of long modulated whistling notes, two-syllabled, the first powerful and vehement, and becoming at each repetition lower and shorter, then ending in a succession of hoarse internal sounds like the stertorous breathing of a sleeping man. When approached all the birds break out into a chorus of alarm, with notes so annoyingly loud and sustained, that the intruder, be it man or beast, is generally glad to hurry out of ear-shot. As the breeding-season approaches they are heard, probably the males, to utter a variety of soft low chattering notes, sounding sometimes like a person laughing and crying together: the flock then breaks up into pairs, the birds becoming silent and very circumspect in their movements. The nest is usually built in a thorn-tree, of rather large sticks, a rough large structure, the inside often lined with green leaves plucked from the trees. The eggs are large for the bird, and usually six or seven in number; but the number varies greatly, and I have known one bird lay as many as fourteen. They are elliptical in form and beautiful beyond comparison, being of an exquisite turquoise-blue, the whole shell roughly spattered with white. The white spots are composed of a soft calcareous substance, apparently deposited on the surface of the shell after its complete formation: they are raised, and look like snow-flakes, and when the egg is fresh laid may be easily washed off with cold water, and are so extremely delicate that their purity is lost on the egg being taken into the hand. The young birds hatched from these lovely eggs are proverbial for their ugliness, Pichon de Urraca being a term of contempt commonly applied to a person remarkable for want of comeliness. They are as unclean as they are ugly, so that the nest, usually containing six or seven young, is pleasant neither to sight nor smell. There is something ludicrous in the notes of these young birds, resembling, as they do, the shrill half-hysterical laughter of a female exhausted by over-indulgence in mirth. One summer there was a large brood in a tree close to my home, and every time we heard the parent bird hastening to her nest with food in her beak, and uttering her plaintive cries, we used to run to the door to hear them. As soon as the old bird reached the nest they would burst forth into such wild extravagant peals and continue them so long, that we could not but think it a rare amusement to listen to them.
According to Azara the Guira Cuckoo in Paraguay has very friendly relations with the Ani (Crotophaga ani), the birds consorting together in one flock, and even laying their eggs in one nest; and he affirms that he has seen nests containing eggs of both species. These nests were probably brought to him by his Indian collectors, who were in the habit of deceiving him, and it is more than probable that in this matter they were practising on his credulity; though it is certain that birds of different species do sometimes lay in one nest, as I have found—the Common Teal and the Tinamou for instance. I also doubt very much that the bird is ever polygamous, as Azara suspected; but it frequently wastes eggs, and its procreant habits are sometimes very irregular and confusing, as the following case will show:—
A flock numbering about sixteen individuals passed the winter in the trees about my home, and in spring scattered about the plantation, screaming and chattering in their usual manner when about to breed. I watched them, and found that after a time the flock broke up into small parties of three or four, and not into couples, and I could not detect them building. At length I discovered three broken eggs on the ground, and on examining the tree overhead found an incipient nest composed of about a dozen sticks laid crossways and out of which the eggs had been dropped. This was in October, and for a long time no other attempt at a nest was made; but wasted eggs were dropped in abundance on the ground, and I continued finding them for about four months. Early in January another incipient nest was found, and on the ground beneath it six broken eggs. At the end of that month two large nests were made, each nest by one pair of birds, and in the two fourteen or fifteen young birds were reared.