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While captive orangutans learn to use tools, wild orangutans have not been observed doing so until recently when researchers witnessed orangutans near Suaq Balimbing in Sumatra using tools to extract insects from tree holes and seeds from the Neesia fruitWhat explains this population's

tool use? It is doubtful that the Suaq orangutans are intrinsically smarter: captive orangutans have demonstrated that the species has the brain capacity to use tools. Another explanation is environmental. While previously studied orangutans mostly inhabited dry forests, the Suaq

orangutans inhabit a lush swamp where insects flourish in tree holes and Neesia fruit is abundant. However, orangutans in other habitats where Neesia grows do harvest the seeds, but without tools they obtain fewer than do the Suaq orangutans.

The passage mentions "orangutans in other habitats where Neesia grows" primarily in order to

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