The name "blackrhinoceros" (Diceros bicornis) was chosen to distinguish this species from the white rhinoceros (Ceratotherium simum). This can be confusing, as the two species are not truly distinguishable by color. Size: the blackrhino is the smaller of the two African species. Weight: adult males weigh up to 1,350 kg and females up to 900 kg. Weight at birth: 35-45 kg. Shoulder height: blackrhinos stand at approximately 1.6 metres tall at the shoulder. blackrhinos A blackrhino shows off his pointed upper lip at the Etosha National Park, Namibia. Both black and white rhinoceroses are actually gray. They are different not in color but in lip shape. The blackrhino has a pointed upper lip, while its white relative has a squared lip. The white and blackrhinos belong to the Order Perissodactyla, or the browsing and grazing animals called “odd-toed ungulates,” which include horses, donkeys, zebras and tapirs. Although critically endangered, blackrhino populations have rebounded since hitting a low of just an estimated 2,475 individuals in 1993. Blackrhinos are much smaller than greater one-horned rhinos, weighing (on average) between 800-1,400 kilograms and reaching 1.5-1.75 meters at the shoulder. Blackrhinoceros are the smallest African species of rhinos. They have two horns sometimes three.