Although there are many good qualities about the African savanna, it does a have a few limiting factors that hinder its ability to be a perfect biome. One is the fact that almost all the rainfall occurs during the span of 6 months and the other 6 months are completely dry. This results in the soil becoming dry and can sometimes lead to fires. Another factor is that the overall availability of water, specifically during the dry season. Because there is so little water to be found, organisms have had to adapt and create complex root systems that retain as much water as possible but sometimes that isn't enough.