A study on orang-utan loss describes that habitat protection alone will not ensure the survival of orang-utans in Kalimantan. The study indicates that orang-utan killings are a serious threat to orang-utan survival. Interesting is that these killings are often non-conflict related as 56% of the respondents said they killed orang-utans to eat.
The study is not denying the role of habitat loss due to e.g. palm oil or other commodities in orang-utan decline, but notes that the role of orang-utan killings have to be taken seriously.