WWF is setting up an Africa-wide rhino database using rhino horn DNA analysis (RhoDIS), which contributes to forensic investigations at the scene of the crime and for court evidence to greatly strengthen prosecution cases. To monitor and protect white rhinos, WWF focuses on better-integrated intelligence gathering networks on rhino poaching and trade, more antipoaching patrols and better-equipped conservation law enforcement officers. Western black rhinos were conserved in National Conservative parks, which did not halt their extinction. It demanded a large amount of money, and the risk of failure was very high. This experiment failed due to corruption. In 1999, World Wide Fund for Nature (WWF) published a report called "African Rhino: Status Survey and Conservation Action Plan." This report recommended that all surviving specimens of the western black rhino should be captured and placed in a specific region of modern Cameroon, in order to facilitate monitoring and reduce the attack rates of poachers. Some attempts were successful, but most experiments failed due to different reasons, including stress and reduced time in the wild. 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. 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.
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