In the wild Black rhinos can reach an age of 40 years.
Black rhinos have the highest incidence among mammals of fatal interspecies fighting: almost 50 % of males and 33 % of females die from wounds. Fights between Black rhinos are usually for establishment and control of their territories. Why they are quite so aggressive is not known: in any event, rhino populations with high mortality rates recover only slowly. In captivity a male Black rhino has reached the age of 49 years, and a female has reached the age of 47 years.