TINGKAHLAKU ORANG UTAN

Like the other great apes, orangutans are remarkably intelligent. Although tool use among chimpanzees was documented by Jane Goodall in the 1960s, it was not until the mid-1990s that one population of orangutans was found to use feeding tools regularly. For example, when water is difficult to get, they chew leaves to make a sponge to soak up water in tree cavities. When it rains very hard the orangutan makes an umbrella for himself out of big leaves.
Many people are familiar with the studies that have shown chimpanzees using tools, such as termite-fishing sticks. Recent studies show that some populations of orangutans also fashion tools to aid in the difficult task of foraging for food.
According to recent research by Harvard University psychologist, James Lee, orangutans are the world’s most intelligent animal other than man, with higher learning and problem solving ability than chimpanzees, which were previously considered to have greater abilities. A study of orangutans by Carel van Schaik, a Dutch primatologist at Duke University, found them capable of tasks well beyond chimpanzees abilities such as using leaves to make rain hats and leakproof roofs over their sleeping nests. He also found that, in some food-rich areas, the creatures had developed a complex culture in which adults would teach youngsters how to make tools and find food.
Although orangutans are generally passive, aggression toward other orangutans is very common and can be territorial. Immature males will try to mate with any female, and may succeed in forcibly copulating with her if she is also immature and not strong enough to fend him off. Mature females easily fend off their immature suitors, preferring to mate with a mature male.
Orangutans have even shown laughter-like vocalizations in response to physical contact, such as wrestling, play chasing, or tickling.