Zebras and Wildebeest in Masai Mara . They are as good partners, are needed. Probably also want to , not surprisingly share the most difficult moments of life, the presence of the other can be used to save his life above and is not disputed . Wildebeest and zebras are like husband and wife. Or more. Share home in middle of the African savannah, especially abundant in the grasslands of the Serengeti ecosystem . They spend much of the year together eating from the same plate , fresh grass, and even bathe together . And right there , in the bathroom, where the marriage bond is unprecedented is narrow. Zebras and wildebeest together represent 90 % of the animals that make up the Great Pack , which is as different groups of herbivores each year star in the Great Migration is known. These groups are primarily composed of wildebeest, zebra and an umpire in marriage : gazelles ( Thomson and Grant , basically) . In total nearly 3 million herbivores : 2 million wildebeest, 700,000 zebras and gazelles half a million are the authors of most pet- migration as regards mammals , between Serengeti and Masai Mara in Kenya and Tanzania respectively. Social classes in Maasai society are related to age, rather than the established social position . A first class of children is established between birth and the age of fifteen . At this stage children live a carefree childhood in which they learn to take care of livestock. The second class or stage ranging from fifteen years to turn thirty and are warriors . The third class corresponds to the period in which it ceases to be a warrior to death, and is the class of the elderly. The intervals between classes are set in cycles of 7 ½ years.