East African herbivores, though they all live in the same environment, have a range of feeding preferences. A. The survival of East African mammals depends more than anything else on the quantity of highly nutritious fruits that they are able to find. B. A herbivore's size and metabolic rate affect the kinds of food and the quantities of food it needs to eat. C. Zebras and wildebeests rarely compete for the same food resources in the same locations. D. The different digestive systems of herbivores explain their feeding preferences. E. Migratory habits are influenced by feeding preferences. F. Patterns in the migratory habits of East African herbivores are hard to establish.