orangutan climbing tree

Orangutan making nest

Someone read my article “Jackie, orangutan who owns a house” and asks, “does orangutan really live in house?” Definitely not! Orangutan spends its night by sleeping on the tree. As this great ape weight about 50 to 100 Kg, it needs something to support its body, so it builds a nest.

orangutan nest on tree
Pic: orangutan nest on the tree

If you walk in Borneo rainforest, you would see huge nest high on the tree. It can be the “bed” of the orangutan. To estimate the number of orangutan population, researchers will count the number of orangutan nests. Other great apes such as gorilla and chimpanzee also build nest. In fact, orangutan is the largest arboreal animal in the world.

orangutan at Kinabatangan
Last month I was on a river cruise at Kinabatangan River nearby Abai Village around 5PM. Suddenly my tour guide exclaimed, “Look! That’s a orangutan!” It was so far away that it took me some effort to spot this adult orangutan on top of a tree at river bank.

adult orang-utan
I had seen semi-wild orangutan in Sepilok Orangutan Rehabilitation Centre and Lok Kawi Wildlife Park, but I only saw wild orangutan a few times.

orang-utan climbing tree
Our boat approached the tree of this orangutan slowly and quietly for closer look. Then it started to climb. “Oh no! It must have seen us and want to flee..” I thought I would lose sight of it very soon.

Tour package to climb Mount Kinabalu

orangutan on tree branch
Wait… It stopped on a big branch and started bending branches.

orangutan making nest
“It’s making a nest,” my guide said, “orangutan builds a new nest every evening for its bedtime.”

orangutan bending branch
Laran (species: Neolamarckia cadamba) is the favorite tree of orangutan for making sleeping nest, so the villagers start to plant more Laran near their places, to promote conservation and nature tourism.

orangutan making nest on a tree
Not every tourist is lucky to see this. I was so excited! It was my day.

orangutan making bed
Orangutan is a tree dweller. It spends most of its time on tree, from foraging, feeding to sleeping. To avoid predators such as Clouded Leopard and Sun Bear, orangutan seldom comes to the ground. That’s why forest is an important habitat for orangutan, and that’s why they become endangered species, after people cut most of the rainforest. Tree is a Home to orangutan.

orang-utan preparing for bedtime
It was folding bigger branches to form a nest scaffold for its bed, then bending down and weaving small branches to form dense leaf covers on top and bottom.

orangutan going to sleep
Its skill was so sophisticated that a tree bed was constructed within 15 minutes. At last it laid down and made itself comfortable.

bedtime of orangutan
According to a research by scientists at the University of Manchester, orangutans show engineering skills when building nests.

tree bed of orang-utan
Such finding is based on a few observations:

  1. Orangutan chooses tree with good structural support for its nest. This is an intelligent decision rather than a random selection.
  2. It knows how to use strong branches as base and thinner branches for a springy mattress.
  3. To take advantage of the flexible branches for making of a tent-like nest, orangutan bends, but does not break the branches and twigs, to keep them attached around.

dusk at Kinabatangan
Again, orangutan impresses me… Good Night orangutan!

Photos taken in Sandakan, Sabah, Malaysia Borneo

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