Of the subjects, 100 were Sumatran ( " Pongo abelii " ), 54 Bornean ( " Pongo pygmaeus " ) and 30 were hybrid orangutans . 113 zoo employees, who were highly familiar with the typical behavior of the orangutans, used a four-item questionnaire to assess their subjective well-being.
12.
Many brought out buckets and water containers to catch the rain . In a news conference yesterday, the World Wide Fund for Nature-Indonesia Program ( WWF-IP ) said fires in lowland forests had " significantly " accelerated the extinction rate of Pongo Pygmaeus, a rare local orangutan species . Two WWF-IP's species conservation experts, Ron Lilley and Barita O . Manullang, said that unless a new concerted conservation effort were initiated soon, the mammal would be gone forever . " The 50 percent of the Kutai National Park space left is not enough for the orangutans, " primate expert Manullang said, referring to the 200, 000-hectare conservation park in the province . Neither Manullang nor Lilley knew the actual number of orangutan left in the province, but Manullang pointed out that the government put the number at about 2, 000 . Manullang said the organization was currently exploring the possibility of recommending the forest area stretching from Lake Sentarum to Lake Bentuang Karimun in the province as a " natural conservation corridor " which could help increase the natural habitat for orangutans.
