About 100 of these rhinos exist in the world and only nine live in captivity. One of three calves born at the Cincinnati Zoo, Harapan is the only Sumatran rhino living outside of Southeast Asia.

Sumatran rhinos are seriously threatened by loss of habitat and poaching. Fewer than 200 live in the wild in Indonesia and Malaysia. The Cincinnati Zoo says there about 10 in captivity worldwide.

The first captive birth of a Sumatran rhino was recorded at the Calcutta Zoo in 1889. The three others, including Andalas, occurred at the Cincinnati Zoo in the United States.

CINCINNATI -- With the survival of a species on the line, Cincinnati Zoo scientists are hoping to mate their lone female Sumatran rhino with her little brother. The desperation breeding effort ...

She’s credited with figuring out how to successfully breed Sumatran rhinos. Her research led to the births of three calves at the Cincinnati Zoo. There are fewer than 80 in the world.

Ipuh, a male Sumatran rhino, was euthanized after his health deteriorated in recent weeks. He was believed to be at least 33 years old. Zoo staffers noticed the rhino was moving stiffly in December.

A Polish zoo is celebrating the arrival of four Sumatran tiger cubs, announcing their birth Friday after keeping it a closely-guarded secret for weeks due to fears they may not survive.

A Polish zoo is celebrating the arrival of four Sumatran tiger cubs, announcing their birth Friday after keeping it a closely-guarded secret for weeks due to fears they may not survive.

In this photo released by ZOO Wroclaw, Four Sumatran tiger cubs are seen at the Wroclaw zoo, which is celebrating the birth of the critically endangered predators, in Wrocław, Poland, Thursday ...