Taman Nasional Gunung Leuser National Park isminangka onesalah ofsiji the two remainingsaka habitat for [[Sumatran Orangutan]]s Sumatra (''Pongo abelii'').<ref>{{cite journal| title=The status of the Sumatran orang-utan ''Pongo abelii'': an update| author=S. A. Wich; I. Singleton; S. S. Utami-Atmoko; M. L. Geurts; H. D. Rijksen; and C. P. van Schaik| journal=Flora & Fauna International| volume=37| issue=1| date=2003| url=http://dx.doi.org/10.1017/S0030605303000115}}</ref> InIng taun 1971, Herman Rijksen established thengadegaké [[KetambeStasiun researchriset stationKetambe]], asawijining speciallytlatah designatedriset researchsing areamligi for thetumrap orangutan.<ref>{{cite journal| title=Life history of wild Sumatran orangutans (''Pongo abelii'')| author=S. A. Wich; S. S. Utami-Atmoko; T. M. Setia; H. D. Rijksen; C. Schürmann, J.A.R.A.M. van Hooff and C. P. van Schaik| journal=Journal of Human Evolution | volume=47| issue=6| date=2004| pages=385–398| url=http://dx.doi.org/10.1016/j.jhevol.2004.08.006}}</ref>