Peter now says orangutans in Sumatra are threatened by pulp and paper companies . He 's trying to release them back into the wild . The numbers of Sumatran orangutans have already dwindled to around 6,000 . ` ` The orangutan is an extremely vulnerable species , '' he says .
Peter now says orangutans in Sumatra are threatened by pulp and paper companies . He 's trying to release them back into the wild . ` ` The orangutan is an extremely vulnerable species , '' he says .