Fun Facts About Black Rhinoceroses The black rhinoceros is smaller than the white rhinoceros.An adult black rhinoceros can reach 1.5 metres in height and weigh in at 1.4 tons.Black rhinoceroses have two horns.The front horn is the longer of the two horns.It is about 50 centimetres in length.The baby black rhinoceros does not live on its own until it is about three years old.