To promote the world image of Indonesia in the field of conservation of animals and ecosystems, especially the great apes, on 18th - 22th December 1991 in Jakarta and Pangkalan Bun Kalimantan was held an International Conference on The Great Apes of The World. In this connection the Directorate General of Posts and Telecommunications on the 18th December 1991 issues a set of commemorative stamps depicting Orangutan (Pongo pygmaeus) which live in Sumatera and Kalimantan Island.
Orangutans are the only great ape family of four who live in Asia, while three other relatives, the gorilla, chimpanzee and bonobo live on the African continent. There are two types of orangutans, the Sumatran orangutan (Pongo abelii) and Bornean orangutans (Pongo pygmaeus). Sumatran orangutan distribution is limited to the northern part of Sumatera. Orangutans in Borneo is divided into 3 sub-types, namely : Pongo pygmaeus pygmaeus, Pongo pygmaeus wurmbii, and Pongo pygmaeus morio.
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