In some villages they are found in immense numbers, often there are several hundreds of nests on the same tree, but it depends on the size of the tree. I have seen several thousands of nests on a single tree, of which they take entire possession for years. The _Sycobii_ are a little larger than sparrows, and the habits of these little twitterers are so remarkable that I never wearied of watching their curious ways, and very skillful and intelligent manœuvres in nest-building or in gathering food. A native village would lose a great charm without them. In many villages of the interior, where people do not move about, trees are planted specially for them, and it is considered an ill omen if they do not come. They make such a noise from morning till night that sometimes it is almost impossible to hear when close to them; the harder at work they are the more noise they make. There are two species, but both live in the same trees and associate indiscriminately with each other, though not, of course, in the same nests. The male of one species is entirely black, and the female a dark gray, while in the other the male is yellow, with black and yellow throat. The eggs of the first mentioned are bluish, with black spots, while those of the other species are light pink, with dark spots. Both kinds of eggs are very beautiful. They are singularly industrious birds: they seem never to weary of work. When they have settled upon a tree on which to plant a colony, they labor from daylight till dark, day after day, with seemingly the utmost joy, fun, and perseverance at their very singular pendent nests. The nest is round in shape, or nearly so, with a narrow passage for entrance and exit leading down one side and opening beneath. It is securely fastened to an outstretched twig, and I have sometimes counted in one tree more than two thousand of such pendent little balls, each inhabited by a family, male and female, of these birds; and once I am sure I saw four or five thousand of these nests. This I saw in the Ishogo country, of which I may speak to you one of these days. The birds when building strip the leaf off the palm, or plantain, or banana tree. They split the leaf into very narrow strips, not more than two or three lines wide, but through the whole length of the leaf in the palm, and the whole breadth of the leaf in the plantain, beginning from the rib.