According to the data released by the International Workshop on Population Habitat Viability Analysis (PHVA)-2004, orangutan population in Kalimantan reaches 57,797 individuals. While in Sumatra, the number is 7,501 individuals.
IUCN (International Union for Conservation of Nature and Natural Resources) estimated that in one or two decades, orangutans will face extinction. This will likely to happen should there be no serious effort taken into account in avoiding it. (Source: Dr Sri Suci Utami Atmoko, Book: Di Ambang Kepunahan [In the Face of Extinction], and PPS Ragunan).
To prevent extinction, in 1991, The Tropenbos Foundation in Balikpapan with the coordination of the Directorate General of Forest Protection and Nature Conservation of the Indonesian Ministry of Forestry, started the orangutan conservation project. Three years later, The Balikpapan Orangutan Society was founded. In 2003, the foundation was renamed to The Borneo Orangutan Survival Foundation.
At the moment, the foundation has 4 programs, those are:
1. East Kalimantan Orangutan Reintroduction Program At Samboja Lestari