[1] As of 2015, there are approximately 134 living Bornean x Sumatran hybrid orangutans in captivity.

In 1985, the Orangutan SSP within the American Association of Zoos and Aquariums (AZA) issued a moratorium on the breeding of Sumatran x Bornean hybrids.

[3] In 1994, it was recommended that those hybrids should be sterilised if they are housed in a situation where breeding may happen.

From 1971 to 1985, 90 orphaned or displaced orangutans rescued from illegal wildlife trade were released into Tanjung Puting National Park in Central Kalimantan.

A subsequent genetic survey determined that at least two orangutans, captured in a different region and therefore not native to the park, had prolifically interbred with the local native apes, and produced at least 22 hybridized descendants.