A recent study shows how orangutans adapt to new environments and choose their food sources. Orangutans, known for their long dependence on their mothers, continue nursing until they reach the age of six. They even stay with their mothers for an additional three years to learn essential skills like identifying, selecting, and processing their diverse diet.
Orangutans food choices after leaving their birth areas
When orangutans venture away from their birth areas, where the available food options may vary significantly, they face the challenge of deciding what to eat and learning how to consume it. To investigate this phenomenon, researchers from different countries collaborated to examine these processes.
The findings reveal a fascinating behavior among migrating orangutans. They tend to adhere to a simple principle: observe and imitate the local residents.
In other words, they learn from the orangutans living in the new area and adopt their eating habits. By closely observing the locals, these migrant orangutans can discover suitable foods and acquire the necessary skills to consume them.
This research provides valuable insights into the adaptive abilities of orangutans when faced with unfamiliar environments. Their ability to learn from their peers showcases their intelligence and resourcefulness in adapting to new challenges.
Behavior of peering to adopt new food options
A recent study conducted by Mörchen and colleagues discovered that male orangutans acquire this valuable knowledge through a behavior known as “peering.”
Peering involves the intense observation of a role model for a minimum of five seconds and from a distance of no more than two meters. During this process, the peering orangutans position themselves to face the role model and exhibit signs of mimicking their actions through head movements, demonstrating their keen interest and attentiveness.
Interestingly, it was observed that male orangutans are more inclined to migrate to new areas once they become independent from their mothers. On the other hand, female orangutans tend to establish their territories relatively close to their birthplace, showing a preference for staying within their natal home range.
Duration of the study
The researchers conducted a comprehensive analysis spanning three decades, utilizing data gathered by 157 trained observers.
The study focused on 77 migrant adult males of the highly sociable Sumatran orangutan species (Pongo abelii) at the Suaq Balimbing research station in Southwest Aceh, as well as 75 adult migrant males of the less sociable Bornean orangutan species (Pongo pygmaeus wurmbii) at the Tuanan station in Central Kalimantan.
During the investigation, the scientists closely examined instances of peering behavior, which involved observing the orangutans for at least five seconds while being within two meters of a role model.
Results of the study on peering behavior
The researchers specifically analyzed 4,009 occasions when the males were within a 50-meter range of one or more neighboring orangutans, including adult females, juveniles, and adult males.
Throughout the study, the males were observed peering a total of 534 times, with this behavior occurring in 207 instances, representing 5.2% of the observed associations. At the Suaq Balimbing station, it was most common for males to peer at local females, followed by local juveniles, while peering at adult males was the least frequent behavior.
Orangutans are the only apes that are primarily arboreal in nature. They spend most of their time in the treetops searching for food. #SevenWorldsOnePlanet pic.twitter.com/38hnInthCl
— BBC Earth (@BBCEarth) March 24, 2020
In contrast, at the Tuanan station, which housed a less sociable orangutan population, males predominantly peered at adult males, followed by immature orangutans, and displayed the lowest incidence of peering behavior towards adult females.
In the Tuanan population, females are known to actively avoid prolonged associations with migrant males, potentially limiting opportunities for peering interactions with them.
The study also found that migrant males, after engaging in peering behavior, demonstrated a higher frequency of subsequent interactions with the specific food items that had been observed during the peering process.
This suggests that the males effectively put into practice the knowledge they gained through their observations, actively engaging with the food sources they had learned about during peering sessions.
Advantages of these behaviors
The researchers emphasized that the precise number of times adult orangutans need to engage in peering behavior to fully acquire a specific skill remains unknown.
However, their observations indicate that depending on the skill’s complexity or novelty, adult orangutans may still engage in exploratory behaviors when encountering food items they initially learned about through peering.
This behavior could serve several purposes, such as gathering more detailed information about the food, reinforcing and memorizing the newly acquired knowledge, or comparing it with their existing knowledge base.
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