it's growing, and its growing everywhere. >> pelley: dickson kaelo works for a non-profit foundation at's paying the masai to turn over management of their land to a wildlife conservancy. >> kaelo: many of the families, before the conservancy started, were very poor, and quite a number of them now are able to survive and diversify away from just keeping cattle. >> pelley: the masai had been expanding their farms and grazing cattle near the migration routes. now, the conservancy manages their land for wildlife, tourists pay to see the wildlife, and the masai get a cut of the profits. families we talked to say they bring in an extra $200 a month, enough to send the kids to school. so this is all part of the conservancy? kaelo has brought nearly 300 square miles under management, and that's growing. >> kaelo: i think the children of our children of our children would like to experience the migration. it doesn't matter whether they are living in china or in the far east or in america, they would like to know that the migration is still continuing. >> pelley: as the wildebeest moved out of