Their population decreased by a massive 96% between 19, the largest decline of any rhino species. The black rhino has a prehensile (or grasping) upper lip, which it uses to draw plant material into its mouth. Rhinos, along with equids and tapirs, are the only surviving members of an ancient and formerly diverse group of ungulates, which originated around 50 million years ago.
The black rhinoceros has four subspecies, one of which was declared extinct in 2011, with two others critically endangered.
