This 29 May 2020 video says about itself:
There are only around 30 Hainan gibbon individuals left in the world, but conservationists see a potential future for this animal.
In the 1970s, the Hainan gibbon almost went extinct on Hainan island off the southern tip of China. Habitat destruction and poaching brought populations down to a mere 7-9 individuals.
But a new gibbon couple has given hope for the rarest primate in the world. A male and female were recently heard “dueting”, which signifies their relationship is established, experts say.