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JUNGLE BOOK by Walt Disney 
I love The Jungle Book so much that it’s actually the only movie that I keep watching for the last several years (but only when I am flying at long distances). However, I need to admit that Disney is not completely right here.
Orangutan is for sure "The Jungle VIP":

Орангутаны Калимантана 

Wallace wrote: "…the Dyaks all declare that the Mias is never attacked by any animal in the forest with two rare exceptions; and the accounts I received of these are so curious that I give them nearly in the words of my informants, old Dyak chiefs, who had lived all their lives in the places where the animal is most abundant. The first of whom I inquired said: “No animal is strong enough to hurt the Mias, and the only creature he ever fights with is the crocodile…

…When there is no fruit in the jungle, he goes to seek food on the banks of the river, where there are plenty of young shoots that he likes, and fruits that grow close to the water. Then the crocodile sometimes tries to seize him, bi the Mias gets upon him, and beats him with his hands and gees, and tears him and kills him.” He added that he had once seen such a fight, and that he believes that the Mias is always the victor".
Just one glance of orangutan makes brazen macaques flee:
Орангутаны и макака 

Орангутаны Калимантана 

Wallace goes on:
"My second informant was the Orang Kaya, or chief of the Balow Dyaks, on the Simunjon River. He said: The Mias has no enemies no animals dare attack it but the crocodile and the python.

Крокодилы в Сафари-парке

…He always kills the crocodile by main strength, standing upon it, pulling open his jaws, and ripping up his throat. If a python attacks a Mias, the seizes it with his hands, and then bites it, and soon kills it. The Mias is very strong; there is no animal in the jungle so strong as he.”


On Sumatra, however, there is an exception – SUMATRAN TIGER.
&quot;Полосатый рейс&quot;

Australian researchers Kaplan and Rogers whose book I highly recommend have written the following:
Каплан и Роджерс

- Exactly when orangutans returned to the trees is unknown….We think that their return to high-rise living must have happened earlier and agree that it may have been in response to being hunted by clouded leopards…
Яванские леопарды
…and the Sumatran tiger. In the past these predators were present in sufficient numbers to be a serious threat to orangutans, although that is no longer a case, especially in Borneo. The fact that Sumatran orangutans, to this day, spend more of their time in the trees than the Bornean population supports this explanation because only in Sumatra does there remain a formidable ground predator, the Sumatran tiger”.

But let’s return to Disney - "Reached To Top" – is also right: spending all his time up in the tropical dipterocarpaceae giants orangutan reached the maximum possible height for primates with such weight - one can’t get taller (otherwise there is a risk of falling down from the thin branches)
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But does orangutan really want to "Stroll Right Into Town / And Be Just Like The Other Men"?
It may seem like this at the beginning:
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Kaplan and Rogers tell us the following story:
"On a narrow road winding through the lower mountains and rain forest of Kalimantan, an orangutan exacts a toll from vehicle drivers who enter his territory. Without fail, he emerges from the thick jungle to stand in the middle of the track with palm outstretched”.
Орангутаны Калимантана
…A small piece of food or a trinket will satisfy him, and he will then disappear until the next intruder is heard in the distance. He is a wild orangutan and seeks no other human contact…”
Can you imagine how much he could probably get if he were in the city?! Only 20 years ago one French read-bearded guy would come to Kuala Lumpur just for begging. After “working” for just a little while he would go to take a rest in his motherland…

On the other side some still feel fine in the woods – here I would like to cite Australian researchers once again – this time it’s about some sybarite orangutans: "…we have even seen individuals build more than one nest a day, one for a siesta and one to sleep in at night".
However…there is no doubt that orangutan is the most unsociable species among primates. Kaplan and Rodgers: “Mature adult males show a marked aversion to each other. Once they are fully matured with cheek pouches and air sacs …
Орангутаны Калимантана
… they live very solitary lives, spending over 90 percent of their time on their own”.
But all this is about adult (means the one who has already spent eight continuous years of his life with his mother) and mature (i.e. the same time together with immature males and females) male orangutan. But even he "…should be described as an antisocial being rather than a hermit. He does seek out females and can be quite charming and gentle".
As for females Australian researchers even use the term "female club culture" (ladies are ladies everywhere, right ? even in rimba :-)
“Although most orangutans spend a good deal of time on their own, adolescent females have something resembling a regular social life.
Орангутаны Калимантана
They either stay with their mother and possibly her other offspring, or they go to meet adolescent females or sub adult males. Adolescent females spend a lot of time playing and feeding together or just sitting around together, appearing to have a good time”, - say Kaplan and Rogers.
And what’s then? Then they give birth and don’t get separated from their babies for many continuous years. But we’ll talk about it later…
Also according to Erik Meijaard, one of the researchers whose work was published in August, 2010 by Public Library of Science: "Whereas some early explorers would see as many as eight orangutans in one tree or encounter 35 along a river in one day, spotting even one in the wild in the same undisturbed forests is now rare. This prompted us to ask if these notoriously solitary apes once lived in much higher densities. We believe hunting may have caused a change in behavior, causing them to be less social". (we’ll talk about it as well…)
Scientists compared orangutans population density in the same areas at present (approximately 2 animal units for 1 square meter) and in 19th century and found that density was 3-6 times more by then .
“Scientists have learned about orangutans by studying them under present-day conditions and densities. But it might be a bit like studying bushmen in the Kalahari to understand the behavior of a New Yorker” - concludes Meijaard.
Орангутаны Калимантана

Nevertheless, Ian Singleton from Sumatran Orangutan Conservation Program believes that the reason of orangutan present solitude could be in the overall impoverishment of even undisturbed forests.
. “Now you have to walk further away from the rivers and closer to the hills to find orangutans. So even though the forests may look similar, and are in the same region, they probably aren’t as good as when Wallace was wandering around”, -says the researcher.
The opinion that orangutans are unsociable only due to unfavorable conditions is also supported by Carel van Schaik who compared our “relatives” in Kalimantan and Sumatra. By the way, I would also like to recommend his book!
Орангутан: Шайк 

Translated by Maria Myutel