The Lindner Center for Conservation and Research of Endangered Wildlife’s (CREW) world-renowned scientists form critical partnerships with other leading conservationists and governmental and non-governmental organizations to achieve CREW’s mission to Save Species with Science®. The Sumatran rhinoceros (Dicerorhinus sumatrensis) is one of the most endangered animals on Earth with approximately 100 individuals distributed throughout fragmented rainforests of Southeast Asia. The goal of the Sumatran rhino program is to keep the rhinos safe in the wild while establishing a successful international zoo breeding program. In 1984, a zoo breeding program was formally established for this species, but efforts to propagate these rhinos in zoos initially failed. In 1997, CREW scientists initiated research using endocrinology and ultrasonography to learn about the reproductive physiology of the species. As a result, scientific breakthroughs led to the first Sumatran rhino calf bred and born in a zoo in 112 years at the Cincinnati Zoo on September 13, 2001.more info Since the birth of that first calf, two additional calves have been produced in Cincinnati. Then in 2007, the Cincinnati Zoo’s first-born Sumatran rhino calf, Andalas, was relocated to the Sumatran Rhino Sanctuary (SRS) on the island of Sumatra, and in June 2012, Andalas’s mate, Ratu, gave birth to a healthy male calf. This series of successful births clearly demonstrates how productive a breeding program in zoos can be when it incorporates good science, veterinary care, animal husbandry and international cooperation. The Cincinnati Zoo and its Indonesian partner, the Sumatran Rhino Sanctuary, are the only two places in the world that have succeeded in breeding the Sumatran rhino in the last century. In addition to its leadership role in the Sumatran rhino zoo breeding program, the Zoo partners with other conservation organizations (Rhino Global Partnerships) to protect Sumatran rhinos in the wild. Funds from the Zoo help support Rhino Protection Units (RPUs) that are trained to protect rhinos from poachers, the greatest threat to the species, and financial support and CREW staff expertise are provided to facilitate the zoo breeding program on Sumatra. The Zoo also provided matching funds that contributed to a Debt for Nature deal struck between the United States and Indonesia in 2014. In return for lowering debt owed to the United States, Indonesia will commit nearly $12.7 million towards the conservation and protection of critically endangered species, including the Sumatran rhino, and their habitats over the next seven years.