it seems that the mountains in the border triangel of Vietnam, Laos and Cambodia are holding the last secrets on this planet:

New ape's kind in South-East Asia discovers

The primates struck the researchers by her song: He could be the precursor of the human music.
The northern yellow cheeks shock of hair gibbons (Nomascus annamensis) live in tree treetops of the hardly accessible mountainous country between Vietnam, Laos and Cambodia. Investigations of the hereditary material and an analysis of the song would have proved that the animals can be separated from other gibbons. Now with it seven gibbon's kinds are known.
The researchers describe the new gibbon's kind in the specialist journal "Vietnamese Journal of Primatology". „The discovery is a small sensation“, said Prof. Walter. The fact that this very rare gibbon's kind of the science had remained up to now unknown, explains the researcher with the only very hardly accessibly mountain region in which live the animal. Besides, the monkeys stayed nearly exclusively in the treetops of high trees. Typically for gibbons are her long arms and the ability to work the way along to themselves with wide swings exactly by the highest tree treetops.
Announcement
The Göttingen scientists have bumped into the track of the new kind by the special song of the animals who presumably serves the territorial defence and a precursor of the human music could be. The analysis of the sound frequency and the sound speed has shown that it concerns own kind, said Walter. Genetic investigations would have booked this in removals of the animals, reported the primate's researcher Christian Roos.
He estimates the number of the individuals of the northern yellow cheek shock of hair gibbon on another about 100. He would be threatened with it similarly strongly like the other shock of hair gibbon's kinds in South-East Asia. Reason for it is the unlawful hunt. Gibbons would be held as domestic animals, would be eaten and processed to traditional medicine.
A big menace is also the loss of the living space by clearings for plantations or the dismantling of mineral resources. As rarest and strongest from the extinction threatened simian kind worldwide is valid the Hainan-shock of hair gibbon from whom there are only about 20 individual
http://www.welt.de/wissenschaft/article9781293/Neue-Menschenaffenart-in-Suedostasien-entdeckt.html