Almost all negroes are agriculturists, living in settled villages. Their houses are usually round huts. The Bongo of the upper Nile build huts about twenty feet in diameter and the same in height, which are firm and well built, though made only of poles and thatch. The entrance is so low that one crawls into the hut on hands and knees. On the conical roof are built benches of straw, on which persons sit to overlook and guard the planted fields. The floor inside the hut is made of hard, well-beaten clay. Skins of animals serve as beds. The Wolofs of the Sudan make very similar huts, but do not construct the seats on the roof. Among both tribes they build little granaries near the huts; these are made of basketwork and are set up on posts to place them out of reach of animals. The African negroes are fond of bright colors and tawdry ornaments. Objects of metal and glass beads are particularly prized. They use rings of iron, copper, and brass of all sizes for the arms, legs, and fingers. Sometimes so many rings will be put upon the arms that they completely cover them. The negroes in some tribes pierce ears, noses, and lips for inserting ornaments. The Bongo women, for example, pierce a series of holes along the rim of each ear, along the edges of the nose, and at the corners of the mouth, and through each hole they thrust a short bit of grass stalk. The men in negro tribes often bear a tribal mark; this is usually the scar or scars left by cutting lines or patterns on the face or chest. Thus the mark of one tribe might be three cuts across each cheek; that of another a pattern of criss-cross lines upon the forehead; another tribe in the central lake district had a line of wart-like swellings, at equal distances from each other, extending from the root of the nose to the top of the forehead. All these tribal marks were cut in childhood, and the cutting must have been painful. It is said that the Bornu baby boys have one hundred and three cuts made on their little bodies for their tribal sign. African negroes often dress their hair into strange and curious forms, as do also the neighboring negroids. They build it up into great horns, train it out in little strings, the ends of which they fasten to a wooden ring, build it into thick mats or wigs, and insert all sorts of fibres, beads, and ornaments in it. Of course such carefully trained hair must not be spoiled by lying on it, so they have the same sort of wooden pillows as the Fiji Islanders, to keep the head off the ground.