This is Harapan. He has an important mission coming up in several weeks' time. The resident of the Cincinnati Zoo will soon be on his way to Indonesia to be part of a breeding program to save his critically endangered brethren.The Sumatran rhino population is estimated to be an alarming less than 100 left in the world. Harapan — known affectionately as Harry to his zookeepers — is the only Sumatran rhino left in the U.S.