Indonesia welcomed its first newborn Sumatran rhino calf last week, for the first time in over a century. Mom Ratu's safe delivery of baby rhino Andatu marked the first birth to take place in captivity in all of Asia in over 120 years, and only the fifth known one in captivity. The birth was described as "a milestone" in the work by wildlife conservation experts, who hope to save this endangered species from extinction. The rare arrival took place at the Sumatran Rhino Sanctuary in the Way Kambas National Park in Sumatra. Indonesia in one of only three countries in the world to have successfully bred the species in captivity. According to the International Rhino Foundation (IRF), there are currently less than 200 Sumatran rhinos remaining in the world, making them the most endangered of all rhino species. The Sumatran rhinos' greatest threat is from poachers, who desire their horns. Their numbers have dropped by more than 50% over the last 20 years, the IRF said. Andalus, the proud father, is actually one of the three Sumatran rhinos bred in captivity at the Cincinnati Zoo in the United States. Andalus was born in 2001, some 112 years after the first known captive birth at Calcutta Zoo in India in 1889. Baby rhino Andatu's happy arrival "Is really a big present for the Sumatran rhino breeding efforts, as we know that this is a very rare species which have some difficulties in their reproduction," the Indonesian Forestry Ministry, said. Follow Ynetnews on Facebook and Twitter