This is Otto, an adult flanged male orangutan, avoiding fires and traveling through a smoke-filled forest in the Tuanan Orangutan Research Station in Indonesian Borneo. Disclaimer: AAAS and ...

Orangutans do this a lot when they’re mad ... In the forests of northern Sumatra, only one dominant flanged male maintains control over a local group of females. Many males in the area retain ...

Researchers in Indonesia documented a male Sumatran orangutan with a facial wound ... he selectively treated his facial wound ...

Both reproduce and an unflanged male can change to a flanged male for reasons that are not yet fully understood. Orangutans are the only primate in which this biological phenomenon occurs. Male ...

The footage, which went viral on Indonesian social media, shows the male orangutan roaming across a chasm of sand streaked with white and black rocks, dug into land still surrounded by vegetation.