New leaves appear several weeks before the start of the rain season. Scientists believe that savanna plant species may have developed this strategy to take advantage of the season variance of the start of the rains. Zebras are a common grazer of the African savanna. Savannas are also home to a number of predator species who prey on grazing animals. The soils are more nutrient rich than tropical forest soils.
Some soils become extremely dry because of evaporation and form laterite layers.
Tropical Rainforest Tropical rainforests occur in a broad zone outside the equator . Annual rainfall, which exceeds 2000 to 2250 millimeters, is generally evenly distributed throughout the year. Temperature and humidity are relatively high through the year. The various trees of the tropical rain forests are closely spaced together and form a thick continuous canopy some 25 to 35 meters tall. Some other common plants include ferns and palms.