Savanna ecosystems are heterogeneous environments characterized by the presence of trees, bushes, and grasses. Nutrient and soil moisture availability are usually the limiting factors affecting the biomass growth in savannas, and overall biomass is impacted by competition, fire, grazing, and harvesting. Savanna grassland soils are not very fertile. The nutrients in the soil are found near the surface as they come from decayed organic matter (vegetation) from the previous growing season. This organic matter decays rapidly due to the high temperatures In the parched grasslands and savannas, or drylands, of Africa, South America and Asia, termite mounds store nutrients and moisture and via internal tunnels, allow water to better penetrate the soil. Dirt mounds the insects build sustain significantly more shrubs, fruit-bearing trees, bugs, and animals, such as elephants, cheetahs, and zebras, than do surrounding areas. Herbivory and burrowing activities can reduce overall plant biomass associated with burrowing mammal colonies, but the higher levels of soil nutrients and greater