CASSELL'S
BOOK OF BIRDS.
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THE SEARCHERS (Investigatores).
The families which, according to natural arrangement, seem to constitute a third division of the great class of birds are principally characterised by the conditions under which they procure their food, viz., by searching for it in situations where it can only be obtained by diligent investigation or laborious exertion. Their diet is usually of a very mixed description, consisting partly of insects and partly of materials derived from the vegetable creation. Many of them were at one time considered to subsist entirely upon the honeyed juices of the fruits and blossoms, among which they spend the greater part of their lives; and, although it is now generally admitted that the insects which abound in the nectared chalices whence they draw their supplies constitute a principal article of their nutriment, they are not the less on that account to be regarded as riflers of the saccharine stores laid up for their use in many a beautiful cup temptingly held forth for their enjoyment. Such are the Honeysuckers and the gorgeously decorated Humming Birds, whose sumptuous garb would seem literally intended to "gild refined gold and paint the lily." A second important group, constituted likewise for the purpose of preying upon insects, has been specially adapted to climb the trunks of trees in search of the innumerable hosts of destroyers that lurk beneath the bark, or in the crevices of wood in progress of decay. These constitute an extensive family, well exemplified by the Woodpeckers; while others, furnished with beaks and feet of very diverse structure, search everywhere for the particular kind of nourishment upon which they are destined to subsist.
The name we have selected for this extensive division of the feathered creation was first employed by Reichenbach, although not exactly in the same sense as that in which we are going to apply the term, neither can we hit upon any single character whereby all the species included under this denomination can be easily designated; nevertheless, however they may differ among themselves, there is a certain conformity in their structure, and a general resemblance in their habits, which will probably be appreciated when we have put the reader in possession of the details contained in the following pages.
We shall, therefore, at once commence their history, by describing them under the following headings.
THE CLIMBERS.
The CLIMBING BIRDS (Scansor) are for the most part recognisable by their slender though powerful body, short neck, and large head. The long or medium-sized beak is either strong and conical, or weak and of a curved form; the feet are short, and the long toes either arranged in pairs or placed together in the usual manner, and armed with long, hooked, and sharp claws. The moderate-sized wing, which is usually rounded at its extremity, and occasionally of great breadth, is never slender or pointed; the formation of the tail is very various. Anything like a general description of the plumage possessed by the different groups of this order would be impossible; some, glittering with gay and even resplendent colours, dart through the air like living gems, whilst others are clad in such dull and sombre livery as to be scarcely distinguishable from the earth or trees upon which they are formed to live. The various representatives of the Scansor may be said to occupy almost every region of our earth; some groups are migratory, and leave their native lands annually with the utmost regularity, whilst others remain throughout the entire year within a certain limited district. Woods and forests are the localities principally occupied by these birds, though they are by no means incapable of ascending rocks, or seeking for their food upon the ground, over the surface of which they run with considerable facility. Their flight is good, but it is upon the trees alone that the Scansor exhibit the full beauty and ease of their movements. All the members of this order consume insects, and many devour fruit, berries, seeds, honey, and the pollen of plants. As regards their powers of song they are by no means gifted; indeed, the most highly endowed amongst them rarely rise above the utterance of a few pleasing notes during the breeding season. The construction of the nests of the Scansor varies so considerably that we shall confine ourselves to speaking of them in their appropriate places.
It is usual among systematic writers to associate many of the birds which we have included in the present order as slender-billed forms of one or other of the preceding divisions, more especially those usually denominated TENUIROSTRES, and perhaps we shall be harshly judged for our departure from the usual custom; be that as it may, the resemblance between some of the Climbing Birds and some Singing Birds is undeniable, and it is upon that ground that we treat of them in this place.