The Fulani are found in twenty nations in a wide swath of Africa -- from Mauritania and Senegal to Sudan, Ethiopia, and Kenya. The Fulani form the largest pastoral nomadic group in the world. The Bororo'en are noted for the size of their cattle herds. In addition to fully nomadic groups, however, there are also semisedentary Fulani. The Fulani are not particularly noted for industrial arts, except for those associated with cattle. They do engage in leather working and some craft production. Many of their former slaves who have assumed Fulani ethnicity follow the basic crafts of other West Africans: silver- and gold-smithing, iron working, basket making, and similar crafts.