The Bornean orangutan's close cousin, the Sumatran orangutan, is also critically endangered, with only about 7,500 individuals left in the wild.
The biggest threat to orangutan populations is the destruction of their habitat. While people will destroy forest for all kinds of reasons - logging or mining or farming - the palm oil industry is responsible for most habitat destruction.
If a farmer comes across an orangutan while clearing land, it's not unusual for him to kill the animal. If the orangutan has a baby with them, the baby is often captured and kept as a pet, or sold through the illegal wildlife trade.
But thanks to their rescuers, Desi and Johnny were able to return to their home.