There are many subspecies of black rhinoceros. The western black rhinoceros was a subspecies native to Cameroon; it was a population that was cut off from the rest of the black rhinoceroses. The nearest black rhinoceros populations were in Kenya, Tanzania and Zambia.
The western black rhinoceros was hunted to extinction. The population was estimated to be only 10 individuals in 2001, and none have been seen since 2006. It was declared extinct by the IUCN in 2011.
Overall, the black rhinoceros species is still critically endangered.