Poaching of rhinos for their horns to be battled by S. Africa, Vietnam The Saint Louis Zoo has announced that a black rhinoceros calf was born to first-time parents, mother Kati Rain and father Ajabu in St. Louis on January 14, 2011. Weighing 120-1/2 pounds, the little male is nursing well and being cared for by his mother, according to Zoo staff. This is the first black rhino calf to be born at the Saint Louis Zoo in 20 years. In all, eight black rhino calves have been born at the Zoo. The black rhino has experienced the most drastic decline of any rhino species. In 1970, it was thought there were about 65,000 black rhinos in Africa. By 1993, there were only 2,300 survivors in the wild. Black rhinos are heavily poached, because it is thought in many Asian countries that the rhino horn has medicinal uses. UPI/Saint Louis Zoo JOHANNESBURG, South Africa, Dec. 10 (UPI) -- South Africa says it has signed an agreement with Vietnam intended to combat the rising illegal slaughter of rhinos for their horns. While international conventions already ban rhino poaching, the number of rhinos killed in South Africa in 2012 was nearly double that of 2010, the BBC reported Monday. The price of rhino horn used in traditional medicine in Asian countries, especially Vietnam, has soared to $29,500 a pound, higher than gold. Buyers in Vietnam are paying such prices for rhino horn they believe can cure a number of ills including cancer, officials said. "The continued slaughter is a cause for immense concern," South Africa's environmental minister, Edna Molewa, said at the signing of the new agreement in the Vietnamese capital Hanoi. The pact will focus on seven areas of cooperation, with each country to appoint a coordinator to help implement the five-year agreement. It is the first official agreement on poaching signed by both countries and has been hailed by conservationists. "Its implementation will of course be down to political will, but the chances are much better if the orders come from high enough in the government," Richard Thomas, a spokesman for the World Wildlife Fund, said.