Amoko hafi 280 y’ibimera bigira uburabyo bituruka mu Rwanda abonwa nk’akomoka muri Albertine Rift. Muri ayo moko cyimeza, hafi 20 yihariwe n’u Rwanda, amoko 50 aboneka gusa mu Rwanda no muri Kongo y’Uburasirazuba ,naho amoko 20 yabonetse gusa mu Rwanda no mu Burundi.