KOTA KINABALU The decline of Borneo's orang utan population is not just due to recent deforestation but had begun to occur over 2,000 years.
A scientific paper study published in Plus One journal by a team experts found that the Borneo orang utans begun experiencing a major demographic decline from about 2,000 years ago based on samples collected in six different study sites in Sabah and Kalimantan.
