Two Sumatran rhinos at Way Kambas are pregnant

Two Sumatran rhinos in the breeding center at Way Kambas National Park are pregnant, Mongabay reported on October 14, 2026. Indonesia's forestry ministry and Yayasan Badak Indonesia announced the pregnancies on October 3. Ratu is carrying her fourth calf, sired by Andalas, and her daughter Delilah is carrying her second, sired by Harapan. Both are due around May 2027, and both pregnancies have reached about eight months. If Ratu's calf is born healthy, she would be the first Sumatran rhino known to have given birth four times. She was brought in from the wild in Sumatra in 2005. Her first calf, Andatu, was born in 2012, and Delilah was born in 2016. Five calves have been born at the sanctuary since the captive-breeding program began in 1984, the most recent in 2023.

Harapan is Andalas's full brother, so he is Delilah's paternal uncle. Both males were born at the Cincinnati Zoo and later returned to Indonesia. The IUCN Asian Rhino Specialist Group estimates 34 to 47 Sumatran rhinos remain in the wild. Indonesia's breeding program holds 11 animals, the only captive ones, and all of the males are related. Nina Fascione of the International Rhino Foundation said the program pairs the least-related animals it can, and that the small population outweighs the genetic limit. The calves are not born yet. The pregnancies are a dated result inside a herd with no unrelated male.