Most of the natural grazing lands in intertropical Africa, i.e., those under summer rainfall regimes, can be called "silvopastoral", for most are found in either dry forest, woodland, bushland, wooded savanna or shrubland.1 Purely herbaceous grazing lands, i.e., grass savanna or "grassland" sensu stricto, are rather rare and restricted to particular conditions of soil, climate and/ or management: for instance on Vertisols, some types of shallow soils, or wet soils, or under very arid climatic conditions such as in the northern Sahel, or some southern African velds, or under management practices that tend to eliminate woody species.