The forest-dwelling humans who share 97% of our DNA
They are the most solitary of the great apes, yet their intelligence rivals our own. Known as the 'person of the forest,' the orangutan is a master of the canopy, using sophisticated tools and building elaborate nightly nests in a display of remarkable cognitive ability.
The orangutan, or genus Pongo, is the sole survivor of the subfamily Ponginae. While they are often thought of as a single group, modern science has revealed a more complex lineage. In 1996, researchers divided them into Bornean and Sumatran species, and in 2017, the Tapanuli orangutan was definitively identified. Interestingly, the Tapanuli species is more closely related to the Bornean variety than to its Sumatran neighbor.
Genetically, these primates are incredibly close to humans, sharing approximately 97% of our DNA. However, they possess 48 chromosomes, whereas humans have 46. Their evolutionary history is equally fascinating; the lineage diverged from other hominids—including humans, chimpanzees, and gorillas—between 19.3 and 15.7 million years ago. Recent genome studies suggest that the divergence between Bornean and Sumatran species may have occurred as recently as 400,000 years ago.
Life in the canopy is defined by extreme arboreal adaptation. As the largest arboreal animals, they spend over 90% of their waking hours in trees. They possess proportionally long arms—with some males reaching a 2-meter span—and flexible hip joints that allow their legs to rotate similarly to their arms. This anatomy enables a 'double-locked' grip using long fingers and short, opposable thumbs, making them masters of vertical climbing and suspension.
Despite their impressive intelligence and tool use, all three species are critically endangered. Human-driven threats, including habitat destruction for palm oil cultivation, logging, and the illegal pet trade, have caused severe population declines. Protecting these 'forest people' remains a vital challenge for global conservation efforts.
Source: Orangutan
