Finally, in the nest of the Edible Swallow, or rather Swift, of India and the Malay Archipelago, we have, perhaps, in its way, as wonderful an example of bird architecture as any that exists. These nests are attached to the face of precipices, and both in this and their general appearance resemble those made by the house-martin, who, before there were houses, no doubt chose precipices too. They are open, however, not domed, so that the resemblance is to a martin’s nest about three-quarters finished, rather than to a completed one. Who can doubt, having regard both to their shape and the site chosen for them, that the bird that makes these nests, or rather its ancestors, used, ages ago, to make them of mud. But this mud was mixed with the salivary secretions—just as in the case of the house-martin now—and these becoming, as the glands developed, more and more viscous and glutinous, as well as more copious, began at last to do duty for the original material, so that now they have entirely taken its place. The substance thus used is, at first, in a semi-liquid state, but dries and hardens till it becomes quite solid. On being steeped in hot water, however, it again softens into a sort of jelly, which is made into soup by the Chinese cooks, and eaten with the greatest possible relish by the Chinese epicures. CHAPTER V BOWER-BIRDS AND GARDENER-BIRDS—HOW BIRDS SHOW OFF—A MALAY TRAP—CRIMSON COMPETITION—LOVE IN A TREE-TOP. As we have seen in the last chapter, some nests of birds are very wonderful buildings, but there are some birds which make much more wonderful buildings than nests. These are the Bower-birds—a family allied to that of our crows and starlings—whose habitat is Australia and some of the adjacent islands. It includes a good many species, and all of them, besides the nest, make another and quite different structure, which is known as the “bower,” but for which “playground” or “garden” is, perhaps, a better name. All three words, however, have something to commend them, for not only do the birds play and sport in and about these rustic buildings, and decorate them sometimes with leaves and flowers; but it is here, also, that the sexes resort, to court and choose one another before the more prosaic duties of matrimony begin. Whilst the nest, therefore, is the nursery, this other structure may be looked upon as the bower of bliss. Generally the birds make it of sticks, grasses, or other materials belonging to the vegetable kingdom, but it differs in each species, so the best way is to describe what it is like in a few of the more salient instances. The Satin Bower-bird makes a sort of platform of sticks, which it weaves together, so that they are firm enough for it to run over. This is the floor of the bower, and now come the walls, which are made of sticks too, but of another kind—long, flexible twigs, which the bird places upright and opposite to one another, on the two longer