The tribe is nomads' social organization. Nomads do not exist without their tribe. The degree of heterogeneity of the tribe determines its aptitude to change.
Tribes, as rhizomes, are consensual units united by what Deleuze calls a "plan of consistency". Their internal cohesiveness is sustained by, and relies on, collective ownership and participation.
As micro-entities, tribes need to resist centralizing pressure from larger entities. Tribes do not want to impose their ways to other tribes, but are ready to fight to defend their own path.