It is the International Union for Conservation of Nature, IUCN, that reports on the success. IUCN keeps track of endangered species around the world.
Despite the increase, black rhinos remain in the category Critically endangered, but a relative of the black rhino, South-western Black Rhino, is downgraded from Vulnerable to Near-Endangered, after several generations of steady growth.
Poaching of all kinds of rhinos in Africa is still a major problem, but has decreased by about 35 percent in recent years.
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