Rhino sperm was conserved in order to artificially fertilize females to produce offspring. There were many attempts to revive the western black and northern white rhinoceroses. The teams had concluded that the rhino was extinct approximately five years before it was officially declared so by the IUCN. For this experiment, 2,500 km of patrol effort resulted in no sign of rhino presence over the course of six months. In 2006, for six months, the NGO Symbiose and veterinarians Isabelle and Jean-François Lagrot with their local teams examined the common roaming ground of Diceros bicornis longipes in the northern province of Cameroon to assess the status of the last population of the western black rhino subspecies. The sub-species was declared officially extinct in 2011, with its last sighting reported in 2006 in Cameroon's Northern Province. Widespread poaching is concluded to be partly responsible for bringing the species close to extinction, along with farmers killing rhinos to defend their crops in areas close to rhino territories. There was a 96% population decline in black rhinos, including the western black rhino, between 19. For much of the 1900s, its population was the highest out of all the rhino species at almost 850,000 individuals. The western black rhino emerged about 7 to 8 million years ago. While it was believed that around thirty still existed in 2004, this was later found to be based upon falsified data. In 2001, this number dwindled to only five. Poaching continued and by 2000 only an estimated 10 survived. 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. By 1980 the population was in the hundreds. As protection efforts declined over the years, so did the number of western black rhinos. Protection measures have brought its numbers back up to about 3,600.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. The population numbered 100,000 in 1900, but declined to 2,400 by 1995. Since then captive breeding and protection measures have brought numbers up to nearly 15,000. The southern white rhino reached its lowest point in 1895, with just 30 in one South African game park. The northern white rhino is also critically threatened as it is down to just four in its only habitat in the Democratic Republic of Congo. Colonial hunters picked off the herbivores as trophies. ![]() The numbers of all types of African rhino have plummeted over the past 150 years. There is a lucrative black market trade in rhino horn, which is prized in Asia as an aphrodisiac. "They looked for spoor, they looked for the rhino's characteristic way of feeding which has an effect like a pruning shear, but they didn't find anything to indicate a continued presence in the area," Richard Emslie, scientific officer with the IUCN's species survival commission, told the BBC.The search missions did, however, come across evidence of poaching. ![]() Specialists from the World Conservation Union (IUCN) mounted 48 field missions in Cameroon, in which they searched across 1,550 miles.
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