Where have wild orangutans consistently made tools for foraging?

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An illustration of a female Bornean orangutan (Pongo pygmaeus) with long reddish-brown fur, hanging from tree branches with one arm extended upward and one leg hooked over a branch. A scale bar at the bottom shows lengths of 30 centimeters and 12 inches for size reference. — orangutan Female orangutans (*Pongo*) have the longest breeding interval of any mammal, giving birth on average once every eight years.

In the wild, orangutans consistently make and use tools for foraging at only one specific location in Sumatra.1

At this location, they demonstrate their cognitive abilities by defoliating sticks to a specific size. These tools are then used to extract insects or honey from tree holes and to pry seeds from hard-shelled fruit.1