Niche partitioning using the zebra, wildebeest, and gazelle provided what useful information about how they use the savanna grasses to survive

The useful information about how they use the Savanna grasses to survive is that they eat at different growth periods of the grass. 
Niche partitioning is the process whereby competing species use the environment differently in a way that helps them to coexist. Natural selection drives competing species into different patterns of resource use or different niches. Coexistence is obtained through the differentiation of their realized ecological niches.