In addition to orangutans, Sumatra is home to many other keystone species. Most Sumatran orangutans live in the Leuser Ecosystem, which contains some of the last intact tropical lowland rainforest on the planet. This ecosystem supports the largest remaining populations of Sumatran tigers, Sumatran elephants, and Sumatran rhinos, as well as 95% of the remaining Sumatran orangutans. It is the only place left in the world where all four species coexist in the wild. Preserving the orangutan's habitat also helps these other species.

  • Other Primates

    Borneo and Sumatra are two of the most biodiverse areas on earth, known for their extraordinarily rich flora and fauna. Read more

  • Land Mammals

    While the islands of Borneo and Sumatra are perhaps best known for their extraordinary array of primate species, they are by no means the only fascinating mammals founds on the ... Read more

  • Rainforest Ecology

    Tropical rainforests are the most biologically diverse ecosystems on earth. While they cover just a small portion of the world’s surface, they're home to around 80% of its biodiversity. Read more