Upon its extreme end grew a tree of singular form and foliage. It was not a large tree, and its branches drooped downwards until their tips almost touched the water. The pendulous boughs, and long lanceolate silvery leaves, rendered it easy to tell what sort of tree it was. It was the weeping or Babylonian willow—so-called, because it was upon trees of this species that the captive Jews hung their harps when they “sat and wept by the streams of Babel.” This beautiful tree casts its waving shadow over the streams of South Africa, as well as those of Assyria; and often is the eye of the traveller gladdened by the sight of its silvery leaves, as he beholds them,—sure indications of water—shining afar over the parched and thirsty desert. If a Christian, he fails not to remember that highly poetical passage of sacred writing, that speaks of the willow of Babylon.
Now the one which grew upon the little peninsula had all these points of interest for little Trüey—but it had others as well. Upon its branches that overhung the water a very singular appearance presented itself. Upon these was suspended—one upon the end of each branch—a number of odd-shaped objects, that hung drooping down until their lower ends nearly rested upon the surface of the water. These objects, as stated, were of a peculiar shape. At the upper ends—where they were attached to the branches—they were globe-shaped, but the lower part consisted of a long cylinder of much smaller diameter, and at the bottom of this cylinder was the entrance. They bore some resemblance to salad-oil bottles inverted, with their necks considerably lengthened; or they might be compared to the glass retorts seen in the laboratory of the chemist.
They were each twelve or fifteen inches in length, and of a greenish colour—nearly as green as the leaves of the tree itself. Were they its fruit?
No. The weeping-willow bears no fruit of that size. They were not fruit. They were nests of birds!
Yes; they were the nests of a colony of harmless finches of the genus Ploceus,—better known to you under the appellation of “weaver-birds.”
I am sure you have heard of weaver-birds before this; and you know that these creatures are so-called on account of the skill which they exhibit in the construction of their nests. They do not build nests, as other birds, but actually weave them, in a most ingenious manner.
You are not to suppose that there is but one species of weaver-bird—one kind alone that forms these curious nests. In Africa—which is the principal home of these birds—there are many different kinds, forming different genera, whose hard names I shall not trouble you with. Each of these different kinds builds a nest of peculiar shape, and each chooses a material different from the others. Some, as the Ploceus icterocephalus, make their nests of a kidney-shape, with the entrance upon the sides, and the latter not circular, but like an arched doorway. Others of the genus Plocepasser weave their nests in such a manner, that the thick ends of the stalks stick out all around the outside, giving them the appearance of suspended hedgehogs; while the birds of another genus closely allied to the latter, construct their nests of slender twigs, leaving the ends of these to project in a similar manner. The “social gros-beak” (Loxia socia) fabricates a republic of nests in one clump, and all under one roof. The entrances are in the under-surface of this mass, which, occupying the whole top of a tree, has the appearance of a haystack, or a dense piece of thatch.
All these weaver-birds, though of different genera, bear a considerable resemblance to each other in their habits. They are usually granivorous, though some are insectivorous; and one species, the red-billed weaver-bird, (Textor erythrorhynchus), is a parasite of the wild buffaloes.
It is a mistake to suppose that weaver-birds are only found in Africa and the Old World, as stated in the works of many naturalists. In tropical America, birds of this character are found in many species of the genera Cassicus and Icterus, who weave pensile nests of a similar kind upon the trees of the Amazon and Orinoco. But the true weaver-birds—that is to say, those which are considered the type of the class,—are those of the genus Ploceus; and it was a species of this genus that had hung their pendulous habitations upon the weeping-willow. They were of the species known as the “pensile weaver-bird” (Ploceus pensilis).
There were full twenty of their nests in all, shaped as already described, and of green colour—for the tough “Bushman’s grass,” out of which they had been woven, had not yet lost its verdant hue, nor would it for a long time. Being of this colour, they actually looked like something that grew upon the tree,—like great pear-shaped fruits. No doubt from this source have been derived the tales of ancient travellers, who represented that in Africa were trees with fruits upon them, which, upon being broken open, disclosed to view either living birds or their eggs!