To Tool or Not To Tool? Orangutans Want To Know
Flexible tool use is closely associated to higher mental processes such as the ability to plan actions. Now a group of cognitive biologists and comparative psychologists from the University of Vienna, the University of St Andrews and the University of Veterinary Medicine Vienna that included Isabelle Laumer and Josep Call, has studied tool related decision-making in a non-human primate species – the orangutan.
Female orangutan
Tool-use in animals is a rare and often quickly rated as intelligent due to its striking nature. For instance, antlions throw small pebbles at potential prey, archer fish down prey by spitting water at them, and sea otters use stones to crack open shells. Nevertheless, most types of tool use are quite inflexible, typically applied to one situation and tightly controlled by processes that are a part of the respective animal’s inborn behavioural repertoire. In contrast, intelligent tool use requires the integration of multiple sources of information to flexibly adapt to quickly changing environmental conditions.
Orangutans share 97 percent of their DNA with us and are among the most intelligent and most endangered primates. They have human-like long-term memory, routinely use a variety of sophisticated tools in the wild and construct elaborate sleeping nests each night from foliage and branches. In their natural habitat, the evergreen rainforests of Borneo and Sumatra, orangutans have to consider several factors simultaneously, such as the predictability to find ripe fruits, the distance and reachability of food as well as the available tools to open extractable food sources. So far it was unknown how orangutans adapt their decisions when the use of a tool is involved and how many factors they can process at the same time in order to make profitable decisions.
Adult male uses a stick tool
Credit: © Alice Auersperg
The researchers used two different types of food items: Banana-pellets, which are the orangutans’ most favourite food type, and apple pieces which they like but disregard if banana-pellets are available. They could extract these items from two different apparatuses: an apparatus required probing with a stick tool to obtain the food item while the other required dropping a ball inside it. Each apparatus could only be operated with the respective tool. During testing, orang-utans were confronted with either one or two baited apparatus/es and a choice between two items (usually a food item and a tool). Once the apes had picked one item the other was immediately removed.
Orangutans flexibly adapted their decisions to different conditions: “If the apple piece (likeable food) or the banana-pellet (favourite food) was out of immediate reach inside the apparatus and the choice was between an immediate banana-pellet and a tool, they chose the food over the tool, even when the tool was functional for the respective apparatus”, explains Isabelle Laumer who conducted the experiment. “However, when the orangutans could choose between the apple-piece and a tool they chose the tool but only if it worked for the available apparatus:
These results are similar to findings in Gofffin cockatoos that have been previously tested in the same task. “Similar to the apes, the cockatoos could overcome immediate impulses in favor of future gains even if this implied tool use. “The birds were confronted with the choice between a tool to retrieve an out-of-reach food item and an immediate reward. We found that they, similar to the apes, were highly sensible to the quality of the immediate relative to the out-of-reach reward at the same time as to whether the available tool would actually work with the task at hand”, explains Alice Auersperg, the head of the Goffin Lab in Austria.
“Optimality models suggest that orangutans should flexibly adapt their foraging decisions depending on the availability of high nutritional food sources, such as fruits”, says Josep Call from the University of St Andrews. “Our study shows that orangutans can simultaneously consider multi-dimensional task components in order to maximize their gains and it is very likely that we haven´t even reached the full extent of their information processing capabilities.”
“According to a 2007 survey by the United Nations Environment Program (UNEP) orangutans will be extinct in the wild within two decades if current deforestation trends continue”, says Isabelle Laumer. “Habitat loss due to extensive palm-oil production is the major threat. Unfortunately palm oil is still the most widely used vegetable oil in the world. As long as there is a demand for palm oil and we keep buying products that contain palm oil, more and more of the rain-forest will be destroyed. Each of us can positively impact the survival of these extraordinary animals by making purchase decisions that may appear small, but that can collectively make a huge impact on our planet.”
Contacts and sources:
Dr. Isabelle Laume
Isabelle B. Laumer, Alice M. I. Auersperg, Thomas Bugnyar, Josep Call. . PLOS ONE, 2019; 14 (2): e0211031 DOI: 10.1371/journal.pone.0211031
Source: http://www.ineffableisland.com/2019/02/to-tool-or-not-to-tool-that-is-question.html
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