In the 1980s, the Indonesian population of the siamang in the wild was estimated to be 360,000 individuals.[1] This seems overestimated noawadays, as an example, Bukit Barisan Selatan National Park is the third-largest protected area (3,568 km2) in Sumatra, of which roughly 2,570 km2 remain under forest cover inhabited by 22,390 siamangs (in 2002 censuses). In Sumatra, the siamang prefers to inhabit lowland forest between 500 and 1000 m above sea level.[2]