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Western black rhinoceros
The western black rhinoceros (Diceros bicornis longipes) or West African black rhinoceros is an extinct subspecies of the black rhinoceros. They were believed to have been genetically different from other rhino subspecies. It was once widespread in the savanna of sub-Saharan Africa, but its numbers declined due to poaching. The western black rhinoceros resided primarily in Cameroon, but recent surveys have failed to locate any individuals. In 2011 it was declared extinct by the IUCN.
This species was named Diceros bicornis longipes by Ludwig Zukowsky in 1949. The word “longipes” is of Latin origin, combining longus (“far, long”) and pēs (“foot”). This refers to the species’ long distal limb segment, one of many special characteristics of the species. Other distinct features of the western black rhino include the square based horn, first mandibular premolar retained in the adults, simple formed crochet of the maxillary premolar, and premolars commonly possessed crista. 
The population has first discovered in Southwest Chad, Central African Republic(CAR), North Cameroon, and Northeast Nigeria.
The western black rhinoceros measured 3–3.8 m (9.8–12.5 ft) long, had a height of 1.4–1.7 m (4.6–5.6 ft), and weighed 800–1,300 kg (1,800–2,900 lb). It had two horns, the first measuring 0.5–1.3 m (1.6–4.3 ft) and the second 2–55 cm (0.79–21.65 in). Like all Black Rhinos, they were browsers, and their common diet included leafy plants and shoots around their habitat. During the morning or evening, they would browse for food. During the hottest parts of the day, they slept or wallowed. They inhabited much of sub-Saharan Africa. Many people believe their horns held medicinal value, which lead to heavy poaching. However, this belief has no grounding in scientific fact. Like most black rhinos, they are believed to have been nearsighted and would often rely on local birds, such as the red-billed oxpecker, to help them detect incoming threats.
Habitat and finding
The black rhino, of which the western black rhinoceros is a subspecies, was most commonly located in several countries towards the southeast region of the continent of Africa. The native countries of the black rhino included: Angola, Kenya, Mozambique, Namibia, South Africa, United Republic of Tanzania, Zimbabwe, Ethiopia, Cameroon, Chad, Rwanda, Botswana, Malawi, Swaziland, and Zambia. There are several subspecies found in the western and southern countries of Tanzania through Zambia, Zimbabwe and Mozambique, to the northern and north-western and north-eastern parts of South Africa. The Black Rhino's most abundant population was found in South Africa and Zimbabwe, with a smaller population found in southern Tanzania. The Western subspecies of the Black Rhino was last recorded in Cameroon but is now considered to be extinct. However, other subspecies were introduced again into Botswana, Malawi, Swaziland and Zambia.
Population and decline
The western black rhinoceros was heavily hunted in the beginning of the 20th century, but the population rose in the 1930s after preservation actions were taken. As protection efforts declined over the years, so did the number of western black rhinos. By 1980 the population was in the hundreds. No animals are known to be held in captivity, however it was believed in 1988 that approximately 20–30 were being kept for breeding purposes. Poaching continued and by 2000 only an estimated 10 survived. In 2001, this number dwindled to only five. While it was believed that around thirty still existed in 2004, this was later found to be based upon falsified data.
The Western Black Rhino emerged about 7 to 8 million years ago. It is a sub-species of the black rhino. For much of the 1900's, its populations was the highest out of all the rhino species at almost 850,000 individuals. By 1995, the number dropped to 2,500 individuals and now the sub-species Western Black Rhino is officially declared extinct with it's last sighting reported in 2006. There was a 96% population decline in black rhinos, including the western black rhino, between 1970 and 1992. Widespread poaching is concluded to be partly responsible for bringing the species close to extinction. The Western black rhinoceros was last seen in Cameroon's Northern Province in 2006. The Diceros bicornis longipes was declared officially extinct in 2011.
In 2006, for six months, the NGO Symbiose and veterinarians Isabelle and Jean-François Lagrot with their local teams examined the area of the Diceros bicornis longipes' common roaming ground in the northern province of Cameroon to assess the status of the last population of the western black rhino subspecies. For this experiment, 2500 km of land was surveyed but no sign of rhino presence was found over the course of six months. The teams had concluded that the rhino was extinct approximately five years before it was officially declared by the IUCN.
Climate Changes and Reproduction
Global warming causes Africa’s already water stressed situation to become worse. It puts much more pressure on herbivore animals. With rising temperatures and drought issues it is harder for the Rhinos to get any type of food source or water. These severe conditions are one of the causes which eliminated the Western Black Rhinos in Africa. Such extreme living conditions make it hard for these animals to survive. Another issue that this Western Black Rhinos have is the slow reproduction of this specie, it makes it much harder for Rhinos to evolve in any way. They only reproduce once per two and half to three years which means that there were more dying than there being reproduced. Overall, the Western Black Rhinos are not able to adapt to the harsh African climates changes and their slow reproduction makes it much harder for them to evolve.
Traditional Chinese Medicine
In the 1950s, Mao Zedong effectively encouraged Traditional Chinese Medicine in an attempt to counter Western Influences. While attempting to modernize this industry, several species were hunted. According to the official data published by the SATCM, 11,146 botanical and 1,581 zoological species, as well as 80 minerals were used. The Western Black Rhino was also hunted due to the value of its horn, which was believed to have the power to cure specific ailments and was effective at detecting poisons (due to its high alkaline content). This, along with the lack of conservation efforts from the IUCN, contributed to the extinction of the subspecies. 
Other Uses for the Horn
Rhino horns were used in making ceremonial knife handles called “Janbiya”. A janbiya is a curved, double edged dagger. The saifani material, which comes from the horn of the rhinoceros, is easily distinguishable and is used as a symbol of wealth and status due to how expensive it is. This is another reason why poaching persisted and the Western black rhinos went extinct.
Rhino horns are very valuable and can cost up to $100,000 per kg in places where they are popular like Vietnam. An average horn varies from weighing about 1 to 3 kg each. Some respected doctors in Vietnam vouch for the rhino horns' cancer curing properties. It is also a newfound party drug, kind of like cocaine but more valuable. People in Vietnam also believe it's a way to let them drink more and cure their hangovers faster. 
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