masegeri rurai lives in the serengeti buffer zone.is job is to safeguard the park, and that means protecting it against humans. the current population of tanzania is 50 million. but that could double in coming decades. masegeri: population growth for the serengeti means more increased consumption of natural resources, and that means more pressure for the wildlife. bushmeat, hunting, and also grazing. livestock is increasingly a big problem. [crowd singing] reporter: cocoba is a community bank. it allows up to 30 villagers to pool their savings until they can afford to invest in something the village needs. many of the participants in the scheme are former poachers or locals who used to live from their cattle. now they're small business-owners. masegeri: the goal of cocoba is to enable communities to be empowered economically to engage into more sustainable economic activities which support conservation in a more positive way. reporter: in populated areas, domestic animals pose yet another risk to wildlife. cows and goats graze on land