Orangutans live solitary lives high in the rainforest canopy—making human study of the endangered creatures difficult (Subscriber Exclusive)
—fellow great apes that live in groups and can be followed and observed relatively easily—orangutans live mostly solitary lives. They spend nearly all their time in the treetops, they wander widely, and for the most part they inhabit rugged forest or swampy lowland that’s hard for humans to traverse. As a result, orangutans long remained among the least known of Earth’s large land animals.
Knott discovered that researchers could collect and preserve urine from female orangutans on filter paper so that the samples could be tested for hormones later. Her work has shown that reproductive hormones in female orangutans peak when fruit is most abundant in the forest—an adaptation to the boom-and-bust environment.
Rows of oil palms replace rain forest near Borneo’s Gunung Palung National Park. Vast expanses of orangutan habitat have been lost to palm oil, used for cooking, food products, and cosmetics.Please be respectful of copyright. Unauthorized use is prohibited. An 11-month-old baby copies mom at mealtime. The juvenile will stay with its mother for up to 10 years as she passes on essential survival skills. Among them: how to find the most nutritious rain forest fruits.The Batang Toru orangutans are believed by some researchers to diverge from others enough to constitute a third species.
Stretching his arms to their full span of seven feet, Sitogos moves through the canopy by using his long-fingered hands and dexterous feet to clamber from branch to branch. A young female, Tiur , follows his every move, approaching closely whenever he pauses. Much smaller and more delicately built, she persists in her pursuit even though he seems indifferent. They sprawl on a branch together, eating flowers and breaking off cuplike fern fronds to drink the water inside.
In the forests of northern Sumatra, only one dominant flanged male maintains control over a local group of females. Many males in the area retain smaller bodies and don’t develop flanges, thereby avoiding the confrontations that inevitably occur when several males try to assert dominance . For the smaller males, the only chance to pass on their genes is to watch from the sidelines, out of reach of the boss, sneaking in for mating whenever possible.
Acting on a tip, a wildlife officer confiscates a baby orangutan kept illegally as a pet. Workers at a rescue center will attempt to teach the orphan how to survive in the wild, but the training is controversial, and finding suitable forest in which to release the apes is growing increasingly difficult.Please be respectful of copyright. Unauthorized use is prohibited.Smoke from forest fires blanketed much of Borneo in late 2015.
This question of how male development is triggered remains unanswered, in part because of the same challenge that faces orangutan researchers on so many fronts: Their subjects are just so difficult to study. Wearing masks to shield their charges from human pathogens, rescue workers conduct daily “forest school,” teaching orphan orangutans to practice skills and natural behaviors for surviving on their own.than just animals’ behavior when they watch orangutans. After all, these scientists took only a slightly divergent route on the great-ape evolutionary highway than did their arboreal subjects. Behind the field notes and data points is the question of what orangutans can tell us about humans.
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