Head to head
Sumatran Orangutan vs Bornean Orangutan
The Sumatran orangutan and Bornean orangutan were once considered a single species, but genetic and behavioural differences led researchers to split them apart, and their day-to-day habits still reflect very different island environments.
| Sumatran Orangutan | Bornean Orangutan | |
|---|---|---|
| Scientific name | Pongo abelii | Pongo pygmaeus |
| Estimated population | Around 14,000 | Around 100,000 |
| Ground activity | Rarely descends to the ground | More comfortable on the ground |
| Key predator pressure | Sumatran tigers | No large ground predator |
| Population decline | Severe, ongoing | More than halved in 60 years |
| Conservation status | Critically Endangered | Critically Endangered |
| Population trend | Decreasing | Decreasing |
| Habitat | Rainforest | Rainforest, forest |
Sumatran Orangutan vs Bornean Orangutan: common questions
Why does the Sumatran orangutan spend more time in trees than the Bornean orangutan?
This species descends to the ground far less often than its Bornean relative, a behavioural difference linked partly to the continued presence of tigers across Sumatran forests, a ground predator threat that the Bornean orangutan's island range does not share.
Which orangutan species has a larger population, Sumatran or Bornean?
The Bornean orangutan has the larger population at around 100,000 individuals, compared with roughly 14,000 for the Sumatran orangutan, though the Bornean population has still fallen by more than half over the past 60 years and both species remain Critically Endangered.
When were the Sumatran and Bornean orangutans recognised as separate species?
Researchers recognised the Sumatran and Bornean orangutans as separate species in the 1990s based on genetic and behavioural differences, after decades of both being classified together as a single species of orangutan.