Izo mu bwoko "white rhinoceros" (inkura zera) zigizwe n'imigwi ibiri: inkura zera zo mu bumanuko "southern white rhino" zoba zishika ku 20000 kandi zikaba mw'ishamba, hamwe n'ubundi bwoko butaboneka cane bw'inkura zera zo mu buraruko "northern white rhino".
