| dc.description.abstract | The study of "Feeding Behaviour Sumatran Orangutan (Pongo abelii Lesson,
1827) at Batang Toru Forest Research Station West Block-North Tapanuli" was
conducted from February to April 2013. Observation of feeding behaviour was
performed using Focal Animal Sampling - Instantaneous - Ad Libitum method.
The observation was done for 339,31 hours in total. Percentage of food consumed
by adolescent male orangutan was comprised of 69,8% fruits, 16,2% leaves,
10,1% pith, 2,4% flowers, and 1,5% insects. Percentage of food consumed by
adult female orangutan was comprised of 65,5% fruits, 15,51% leaves, 8,6% pith,
6,6% bark, 2,1% flowers, and 2,1% insects. Percentage of food consumed by
juvenile female orangutan was comprised of 57,3% fruits, 15,53% leaves, 13%
pith, 12,3% flowers, 1,2% bark and 0,9% insects. It was observed that Batang
Toru orangutans in the study area mainly feed on fruits as the main food and
alternative foods include leaves, pith, flowers, bark and insects. Foods consumed
by the orangutans in the study area consists of 63 species of plant and two species
of insect. The use of tool was not found in Batang Toru orangutan for extracting
food. The use of tree‟s canopy for feeding by adult female orangutan is 10,19% in
lower canopy, 63,82% in middle canopy and 25,97% at the top of canopy. For
juvenile female orangutan, 3,81% spend in lower canopy for feeding, 62,45% in
middle canopy and 33.72% in the top canopy. While adolescent male orangutan
spend 5,61% in lower canopy for feeding, 78,06 % in middle canopy and 16,31%
in top canopy. | en_US |
