The nests of this order of birds are of very various construction, and the number of eggs never large. The task of incubation usually devolves upon the female, who is cheered and tended by her mate during the period of her seclusion, but he also occasionally shares her labours, and both parents co-operate in feeding and taking care of their young. Many species are considered inimical to mankind, on account of their marauding attacks upon property; and yet the benefits they confer far outweigh any injuries of which they may be guilty. They clear away the seeds of noxious weeds, free the plants from insects; and their lively and cheering presence in the woods, their beauty, their song, and the ease with which they are tamed, together with other good qualities, fully entitle them to our admiration and regard. The flesh of most of them affords an appetising and healthy food, and the plumage of some species forms a beautiful and admired decoration.
If it is ever permissible to compare animals of one class with those of another, we would state our opinion that the parrots hold among birds much the same position as that occupied by monkeys among quadrupeds. The truth of this remark will become obvious as we proceed with their history. Most systematists have considered parrots as entitled to take but an inferior place in the zoological series, founding this opinion upon a single characteristic which they share with many other birds of far humbler endowments; we allude to the prehensile structure of the foot. Parrots, Woodpeckers, Pepper-eaters, Curacus, Barbets, and Jacamars, are all climbing birds; that is to say, they all have two toes placed in front and two directed backwards; and, immaterial as this structure of the foot may appear, it has been deemed a sufficient reason for forming an order embracing several races of most dissimilar form, which present only this one feature in common. Little stress should, in reality, be laid upon this disposition of the toes, from whatever point of view it is regarded, seeing that Woodpeckers, Tree-creepers, and a great number of others that do not possess the scansorial foot, vie with the so-called climbing birds in the facility with which they climb. The three-toed Woodpecker is not inferior in the dexterity with which it can use its claws to any four-toed scansorial species; and we shall, we believe, be giving this climbing foot its proper appreciation if we compare it to and rank it with the flexible tail of some mammalia, the possession of which is not confined to any particular race, but bestowed alike upon arboreal species of the most various kinds. A foot of this description is by no means of such uniform structure as is usually supposed, and, in truth, is scarcely less varied than are the birds themselves; the foot of the parrot, in particular, differs essentially from the pair-toed foot of other Scansores, in the development of the central part, which renders it in its functions comparable to a hand. The parrots, in fact, constitute a distinct and very clearly defined race, their most distinguishing characteristic being found in the structure of their beak, which can never be mistaken for that of any other bird. At the first glance, indeed, the beak of the parrot would appear to resemble that of the birds of prey; but it is, in reality, much thicker and stronger, and also comparatively higher and more symmetrical in its form. The legs are thick, strong, and fleshy, but never long; the tarsus much shorter than the middle toe, and always covered with small scaly plates; the toes are moderately long, and have a thick sole, but this exists only on certain peculiar ball-like elevations; upon their upper surface the feet are covered with minute scales, resembling those of the tarsus; and these scales, as they approach the ends of the toes, become gradually larger, and project beyond the base of the claw upon the terminal joint in the shape of short tubular or band-like plates; the claws are not long, but much bent and tolerably sharp, never very powerful. The structure of the wings is in exact correspondence with that of the feet; the bones are of moderate length, but strong; the pinion feathers tolerably numerous—twenty to twenty-four. The compactly formed primary quills are seldom long, but so disposed that the outspread wing is generally pointed; the tail-feathers vary considerably in different species, both as regards length and shape. The general plumage is remarkable on account of its compactness; it consists of few feathers, but these are usually of large size, with the exception of those covering the head, which are small. The eye is in many instances surrounded by a naked patch of skin, which during life is usually powdered over with white dust. The body feathers are each furnished on the under side with a large downy appendage. The coloration of the plumage, notwithstanding its great diversity, will require notice, as presenting a feature very distinctive of the different races of parrots. The prevailing tint is a more or less vivid leaf-green; but we also meet with hyacinth, blue, purple, red, golden yellow, and at times darker hues; their distribution is also characteristic, more especially the frequent occurrence of complementary colours upon the upper and under sides of the same feather—blue-violet, dark blue, light blue or green above, with light yellow, orange-yellow, cinnabar red, or purple underneath. Not less peculiar is the frequent concealment of glowing tints among others which are less conspicuous, as, for example, in the case of some Cockatoos in which we meet with feathers having their lower portion and their downy roots of a deep cinnabar red or brilliant yellow, and yet this portion is seldom visible, on account of the length of the white feathers among which it is hidden.
The extraordinary intelligence exhibited by some parrots is particularly remarkable; it is, indeed, their sensible behaviour, not their form, that makes us regard these creatures as representatives of the Quadrumana. The parrot has, superadded to the form of a bird, all the qualifications and troublesome propensities of the monkey—humoursome and fickle at one moment, gentle and agreeable at the next; it is intelligent, active and circumspect, provident and crafty, very quick in discernment, and possessed of an excellent memory; on this account it is eminently susceptible of instruction, and may be taught almost anything. On the other hand, it is choleric, malicious, spiteful, and deceitful; it forgets injuries as little as it does kindnesses; it is cruel and inconsiderate to creatures weaker than itself, tyrannically ill-treating the helpless and unfortunate, as does the monkey. It has been the fashion to rank parrots as inferior to many other birds, because they do not exhibit such conspicuous capabilities of locomotion; they are, nevertheless, very well endowed, even in this respect. The larger species fly with apparent heaviness, but with considerable rapidity; the smaller, wonderfully well—so well, indeed, that we have been almost consoled for the loss of a favourite bird whilst watching the beauty of its flight. Very many appear to be quite out of their element when upon the ground, they seem to hobble rather than to walk, but there are some Ground Parrots that run swiftly and with much facility; and Gould makes mention of a Grass Parrot that he saw running upon the ground like a plover. The capability of hopping from bough to bough is an accomplishment in which parrots are deficient, nevertheless they have their own mode of progression among the branches; any considerable space they fly over, but smaller distances they pass by climbing, and that with considerable rapidity, unwieldy as some of them appear; helping themselves along by means of their beak, as well as their feet, while other birds use their feet only. Parrots are unable to swim, and are quite incapable of diving. The bill is far more movable than that of any other bird, and is useful for many purposes. Their voice is harsh and screaming, but yet not entirely destitute of an agreeable sound when heard in their native haunts. Some species will learn to whistle tunes with remarkable clearness and accuracy; the faculty which they possess of imitating the human voice and speech is well known—their performance, indeed, is wonderful; they do not babble, they speak, and seem to know the meaning of the words they use.
With the exception of Europe, parrots are to be met with in all parts of the world, more especially in tropical regions; one American species ranges as far north as 42°, and another is found in the southern hemisphere, as far as the inhospitable wastes of Tierra del Fuego, in 53° south latitude. Cockatoos are known to inhabit New Zealand and Macquarrie's island, 52° south. In Asia and Africa, the parrots are principally confined to the limits of the torrid zone; in China, they rarely pass 27° north latitude, and in India, at furthest, only extend to the foot of the Himalaya mountains. In Western Africa, they rarely go beyond 16° north, and in Eastern Africa, according to our information, not further than 15°; but towards the southern hemisphere they probably are to be met with at a greater distance from the equator.
Generally speaking, the woods are their favourite haunts; but this is by no means universally the case. There are certain species, for example, which only frequent treeless plains or wide steppes; in the Andes some are to be found living far beyond the region of trees, even at an altitude of 11,000 feet above the level of the sea.
In the north-east of Africa, according to our own experience, they almost exclusively reside in places frequented by monkeys, insomuch that apes and monkeys seem to be their inseparable companions. The more extensive the forests—that is, the richer they are in vegetation—the more these birds abound; indeed, in the tropical forests, they constitute a large—we might almost say, the largest—proportion of the feathered inhabitants. The same remark applies to Australia, as well as to many localities in India, and in part also to Africa; in these countries parrots are as numerous as crows are in Europe, and as common as sparrows.
They would seem to understand how to make themselves conspicuous; and while they deafen the ear with their discordant cries, enliven the dark shades of tropical forests with their lavishly-coloured plumage. "It is impossible," says Gould, "to describe the enchanting scene afforded by certain parrots, more especially by those adorned with feathers of glowing red, as they wheel their varied flight among the silver-leaved gum-trees of Australia, their gorgeous plumage standing out amid the surrounding scenery with wonderful effect."
"Morning and evening," writes Schomburgk, "countless multitudes may be seen at a considerable height, making an insufferable noise; one afternoon I saw such a prodigious flight descend upon the trees by the river-side, that the branches bent low under the weight of the birds." "It is necessary to have lived in these countries, more especially in the hot valleys of the Andes," says Humboldt, "to believe it possible that the shrieking of the parrots actually drowns the roar of the mountain torrents as the waters leap from rock to rock. What would those wondrous tropical forests be without parrots? Lifeless gardens of enchantment, a wilderness of silence, a solitary desert; by these birds they are awakened and kept alive, for the parrots know equally well how to find occupation both for the ear and eye of the traveller."