The Pampas deer of southern Argentina once were very abundant but now considered a threatened species by the IUCN. The IUCN separates the subspecies "O. b. celer" in southern Argentina as endangered. The diseases that particularly plague "O. b. celer" are gut parasites and food and mouth diseases. Their overall decline is due in part from hunting and poaching, but also from habitat loss due to agriculture, diseases from domesticated and feral livestock, competition from more recently introduced wildlife, and general over-exploitation. There is less than 1% of their natural habitat left that was present in 1900. The deer in Argentina and Uruguay have no natural predators. They used to be the prey of cougars and jaguars. Those in Brazil still have cougars to fear. Some areas of population loss are easily tracked to poaching because of the few number of deer in an area. In the mid-1970s, 10 individuals out of a group of 16 located in Punta Medanos were killed by poachers. The rest were wiped out by extensive human activity. Lack of funding and technology have made it difficult for biologists to track and help the deer population, but donations and grants from organizations and universities in the United States have helped immensely with the situation. In 1975, there were less than 100 of subspecies "O. b. celer", but by 1980 there were 400. The population has been continuing to increase, although not at that high of a rate. Some of the discrepancy is due to the fact that later they found groups they did not know existed.