The numbers of Sumatran orangutans have already dwindled to around 6,000 . Peter Pratje says orangutans in Sumatra are threatened by pulp and paper companies . He 's working to introduce orangutans back into the wild . PETER PRAJE :
Peter Pratje says orangutans in Sumatra are threatened by pulp and paper companies . He 's working to introduce orangutans back into the wild . PETER PRAJE :